Norway killer Anders Behring Breivik trial: day four as it happened 3.52pm The prosecution tells the press conference Breivik will tomorrow explain exactly what happened on Utoya. It's going to be a difficult day to get through tomorrow. 3.48pm A press conference with lawyers involved in the case is currently ongoing, with some interesting developments. The prosecution have said they would have liked to have called Breivik's mother as a witness, but that she is "unfit to appear in court." We hear also that a psychiatrist who assessed Breivik when he was 4-years-old has been called as a witness. 3.43pm For a summary of the day's main developments, focussing on Breivik's claims that the "primary target" for his attack was in fact the former prime minister of Norway, see this piece here. 2.44pm Court is adjourned for the day, we leave you with this from our man in the courtroom David Blair: Apart from when the court watched the unedited CCTV footage of the bomb attack, this has been the most disturbing session so far. We now know that Breivik considers himself an innocent party who was forced to massacre 67 defenceless teenagers by the media, the Norwegian government and the victims themselves. A few minutes ago, prosecutor Inga Bejer Engh asked "Do you consider yourself a person of empathy?" The reply was emphatic: "Absolutely." I think today's hearing will be of great help to the court when it decides on the question of Breivik's sanity. 2.34pm Interesting exchange between Breivik and prosecutor Inga Bejer Engh as they discuss who he sees as a valid target. The killer said that Norway has 12 "category A" traitors, 4,500 in "category B" and 90,000 in "category C." "So which category am I?" asked Engh. "Oh, you wouldn't be on the list at all," said Breivik. 2.22pm The court has heard that Breivik considered his car bomb to be a failure because the building he targeted did not collapse. 2.15pm David Blair with the latest: Breivik planted his bomb later than planned because he first chose to email his manifesto to far right supporters across Europe. The result? Lots of error messages as Outlook struggled with such a big email. So the explosion happened some time later than expected. Some people lived and some died because of that quirk of fate. Another quirk of fate - this time a good one. Breivik had picked the exact spot where he would park his car bomb for maximum effect. But when he arrived, the place was taken. "The bomb had a lot less force because I had to ignite it at the wrong angle," he said. 1.54pm The questioning has turned to Breivik's use of drugs and hormones. 1.44pm We are now hearing about the bombs Breivik manufactured. He had trouble finding a large enough farm to use as a cover story for justifying the purchase of fertilizer. 1.38pm More detail on the weapons is emerging. 1.28pm We're now learning about how Breivik went about obtaining his weapons. His first idea was to go to Prague and buy them from the criminal fraternity - he told friends he was going on a book tour. He tried this, but failed. So he decided to obtain his firearms entirely legally. 1.09pm A few thoughts from David Blair during the recess. The last few minutes have spread ripples of shock throughout the courtroom. Breivik is effectively saying that everyone forced him to carry out the massacre - the media, the Norwegian Labour party, the victims themselves - and that he was just about the only innocent party. The whole world was out of step, except him. Suddenly, he comes out as the coldest of narcissistic killers. 1.00pm In the last few minutes, we've had a real insight into the way Breivik's mind works. As he sees it, the Norwegian government forced him to carry out the gun attack on Utoya island by making it hard for him to get hold of the chemical fertiliser needed to make bombs. Meanwhile, the children on the summer camp forced him to shoot them by being supporters of "multiculturalism." He conceded that it was wrong to kill people "under the age of 18," but said that people on the island "turned away from him" while he was walking around firing his guns, so he couldn't work out their age. So it was their fault if they were under 18 and he shot them anyway. This massacre seems to have been everyone's fault except Breivik's. 12.57pm The previous line of questioning, and the chilling responses from Breivik have clearly had a major impact on those in court. 12.54pm The prosecutor has called for an early recess following detailed questioning on the Utoya killings. David Blair writes: Breivik has gone into further excruciating detail about his plans on Utoya island. The aim was to "kill everybody" on the island - about 500 people at the time - by using the gun attack as a way of spreading terror and the water as a "weapon of mass destruction." Breivik thought that all those who he didn't shoot would flee into the sea and then drown. He agreed it was wrong to kill any one under the age of 18, but said that he would "distinguish" those who were younger. "But that turned out to be impossible," he added. As for why it was necessary to carry out a gun attack, the Norwegian government had "relieved" him of the possibility of making more bombs by restricting the availability of chemical fertiliser. 12.50pm Breivik is pinning the blame for his actions on politicians, the EU and the media. 12.43pm We have moved on to more detailed questioning about his attack, and how he selected his targets. 12.33pm Breivik has revealed that Gro Harlem Brundtland, the former prime minister of Norway, was the "primary target" of his attack. He thought she would be on Utoya island and he would have "cut her head off while filming it." He brought along a bayonet and a knife for this purpose and said he aimed to handcuff her before decapitating her. "Decapitation is a traditional European death penalty method," he explained. It is not only al-Qaeda who use it. Former Norwegian prime minister Gro Harlem Brundtland (AFP/Getty Images) 12.18pm We're also hearing more about the research Breivik carried out before the attacks. 12.16pm If you're looking for an overview of the developments today, we've written this piece summing up what we've heard so far. 12.10pm We've learned another chilling detail about the killer's plans. David Blair, in court in Oslo, has more: He considered hijacking a petrol tanker and detonating it with high explosives to create a "poor man's atom bomb" with an explosive force of 0.1 or 0.2 megatons. The target of this weapon would have been the annual Labour Day parade, which would have caused the deaths of "several thousand people." 12.04pm The handcuffs are of off and the afternoon session has begun. The questioning picks up where it left off. 11.10am The court has risen for lunch. In the last few minutes we have heard that Breivik planned to wreak far more devastation than Oslo suffered on 22 July last year. He had come up with a plan for three car bombs and a gun attack and his list of targets ranged from newspaper offices to the royal palace to a square in the centre of Oslo with a particular "pastry shop." Again and again, he came back to his hatred of the media, saying that a national conference of journalists would have been "the most attractive target in Norway" and that he considered hitting it with both a car bomb and a gun attack. But he was not able to complete his preparations in time. When the court returns, we will presumably learn why he eventually settled on Utoya island as the setting for his rampage. Chemicals discovered in the garage of Breivik's farm 10.55am Our reporter David Blair sends this: Horrifying details have now emerged of the scale of Breivik's murderous ambition. He planned three car bombs and a gun attack. He scouted a variety of targets including the palace, parliament and Labour party headquarters. He then aimed to raid the HQ of a TV channel and "execute as many journalists as possible." But he would have chosen a day when the King wasn't in his palace because "like many cultural conservatives" he believes in the monarchy. Two of the car bombs would have weighed a ton each, the third would have been 500 kg. Equipment discovered in the garage of Breivik's farm 10.50am More details are emerging about Breivik's attack plans, and how they were scaled back due to "production problems." 10.47am We are learning more about Breivik's choice of targets. He says he made the decision to attack political targets rather than Muslims because "it's not the fault of the Muslims that they have been invited here." 10.37am Breivik has repeatedly attacked the first psychiatric report - the one that declares him insane - calling it a "fairytale." The report states that he only decided to become violent in 2009. He says it was 2006. An interesting observation on this from Sky News reporter Trygve Sorvaag: 10.35am Breivik has come out as a slow-burn revolutionary, David Blair reports. He decided on violent action when he was 20 in 1999, but it took him another seven years to start scouting out likely targets. In 2006 he began reconnoitring the government quarter of Oslo - and the attack took place five years later. In the meantime, he lived with his mother, spent most of his time in his bedroom and only met her at mealtimes. 10.26am For the first time, the cool, controlled and supremely skilfull prosecutor, Inga Bejer Engh, has shown signs of exasperation. Breivik described his manifesto as a "draft" and said that he didn't necessarily agree with all of it. Engh fired back: "So you killed 77 people without being entirely sure whether you agreed with the manifesto or not?" "Let me explain," replied Breivik. "Yes, do!" said the prosecutor. 10.13am The BBC's Steve Rosenberg and Sky News reporter Trygve Sorvaag describe a different Breivik in court today. 10.11am Once again, we see Breivik's desire to be taken seriously and play the political philosopher. The purpose of his manifesto was, he said, to "reconcile" the traditions of national conservatism, national socialism and the "militant Chrisitianity" of "true believers." He wanted to "form a bridge between these various ideas." 10.00am David Blair suggests Breivik might have picked the wrong battle to commemorate: As someone who is old enough to have learned his history from lessons and books, as opposed to Wikipedia, I would suggest that the Battle of Lepanto of 1571 was a far more significant event. This clash at sea destroyed Turkish naval supremacy in the Mediterranean and began the long retreat of the Ottoman Empire. 9.56am The significance of "2083," the date given in Breivik's manifesto for a "declaration of independence" for Europe has been explained. That year will be the 400th anniversary of the defeat of the Turks at the gates of Vienna in 1683, a battle that halted the Ottoman Empire's expansion along the Danube valley. Breivik will have looked this up on Wikipedia, which he previously admitted was where he did most of his research, David Blair suggests. 9.46am The court is back in session. The prosecution are returning to Breivik's career as a full-time player of World of Warcraft which took up a year of his life. 9.29am The prosecution are not letting go of Breivik's ideology and manifesto, our chief foreign correspondent David Blair reports: The lawyers are continually probing his motivation for his crimes. As one of the prosecutors put it, this can be reduced to "two bullet points," namely: defending "indigenous" Europeans and expelling Muslims. Breivik's thousands of words, most of them copied, boil down to that. 9.23am Court breaks for a 20 minute recess. Breivik is handcuffed and taken back to the cells 9.17am More from David Blair: Occasionally, Breivik shows flashes of self awareness. After disclosing that he gave mythological names to his guns, he told the prosecutor: "The way you're trying to describe it, it sounds bizarre and insane." Meanwhile, he concedes that "50 - 60 percent" of his manifesto was a "cut and paste" job where he simply copied other people's work in his bedroom. His is visibly embarrassed by this, showing that he has some sense of how the world perceives him. Breivik in the witness box 9.11am Breivik gave names from Norse mythology to the weapons he used to kill 67 people on Utoya island. He called his rifle "Gungnir" after the magical spear of Odin, and he named his handgun "Mjolnir" afrer Thor's hammer. Meanwhile, the vehicle he used to drive to the island was called "Schleipnid" after the eight-legged horse of Odin. "It's a European tradition" to give names to weapons, explained Breivik. It's a great European tradition. 9.03am Our man in the courtroom David Blair has this: Computer games such as Call of Duty Modern Warfare were key tools for Breivik's preparation for the attack. Virtual reality games allowed him to practise using a telescopic sight. When he bought the real thing, he discovered that "you could give it to your grandmother and she would be an optimal marksman." Breivik calculated that his chances of surviving the bomb attack on the government quarter were only "5 per cent." He anticipated being "caught in a pincer action" by armed police and the "only option would have been to fight my way out." He was genuinely astonished by the lack of a security response. 8.58am Breivik laughs in court as he accuses the prosecutor of trying to "ridicule" him - again - with his questions about playing World of Warcraft and other computer games. 8.37am Breivik now being asked about his year playing World of Warcraft. He says his desire to play full time was one of the reasons he moved back in to his mother's address, and that he had justified taking a year off due to his hard work between 2002-2006. He denies the game, which he played for up to 16 hours a day, had any influence on him and says it had "nothing to do" with the July 22nd attacks. He insists it is a "strategy game" rather than a violent one. 8.36am Prosecutor says she is moving on from questions about finances but will return to them later.