A suspected car bomb exploded across a secondary school in the Turkish capital on Tuesday, wounding 15 people, authorities said. 
 
 There was no immediate claim of responsibility, but the attack comes at a time when Kurdish rebels fighting for autonomy in southeastern Turkey have escalated their attacks on Turkish targets. The rebels carried out deadly bomb attacks in Turkish cities in the past. Islamic and leftist militants were also behind some bombings in this NATO-member and U.S. ally country. 
 
 "There is information that a bomb was planted on the vehicle," that exploded in the downtown Kizilay district, said Deputy Prime Minister Bulent Arinc. 
 
 The blast wounded 15 people, said Besir Atalay, another deputy prime minister. At least three of the injured were in serious condition and some of them reportedly lost their limbs. 
 
 "I felt the blast effect of the explosion some 500 meters (547 yards) away," said Ekrem Erkoc, a 42-year-old eyewitness. "I saw vehicles on fire and an injured man said people lost their limbs." 
 
 The injured were initially treated in the school yard before medics rushed to the scene and whisked them away to hospitals, NTV television said. 
 
 Kurdish rebels were last blamed for a small bomb attack in the Mediterranean resort town of Kemer on Aug. 28 that injured 10 people, including four Swedish nationals. 
 
 Kurdish rebels have been fighting for autonomy in Turkey's mainly Kurdish southeast since 1984. 
 
 Turkish warplanes have bombed suspected rebel hideouts in northern Iraq last month in response to an escalation of attacks by the guerrillas. Turkey has not ruled out a cross-border offensive against Kurdish rebel bases in northern Iraq. ||||| At least 28 people have been killed and 61 more wounded in a large explosion targeting a military vehicle in heart of the Turkish capital of Ankara. 
 
 Al Jazeera's Zeina Khodr, reporting from Gaziantep, said officials believed a car bomb had caused the explosion on Wednesday evening and the target had been Turkish military personnel, who were travelling in a vehicle which was stopped at traffic lights. 
 
 The death toll rose steadily on Wednesday night, with those wounded in the blast sent to hospitals across the city. 
 
 Turkish President Recep Tayyip Erdogan called for an urgent emergency meeting with top-level security officials in Ankara. 
 
 "We will continue our fight against the pawns that carry out such attacks, which know no moral or humanitarian bounds, and the forces behind them with more determination every day," Erdogan said in a statement. 
 
 There was no immediate claim of responsibility, but government officials said they were treating the incident as a "terrorist" attack. 
 
 Analysts and unnamed Turkish officials said the Kurdistan Workers' Party (PKK) armed group would be among the leading suspects. 
 
 The explosion was heard across the capital when it went off at about 6:15pm local time. 
 
 The attack happened at the height of evening rush hour, not far from Turkey's parliament, government buildings and military headquarters. 
 
 Witnesses shared images on social media showing a large plume of smoke rising into the sky and and local news footage showed a large fire burning at the site of the explosion. 
 
 "This is really in the heart of the Turkish capital - it is clearly a message to the Turkish government," Khodr said. 
 
 "This is the fourth major explosion in Turkey in the past few months." 
 
 'Terrorist' act 
 
 Turkish Deputy Prime Minister Numan Kurtulmus said in a speech that the "blatant, treacherous attack" was well organised. 
 
 Deputy Prime Minister Bekir Bozdag said on Twitter the attack was an act of terrorism. Prime Minister Ahmet Davutoglu, who had been due to leave for Brussels later on Wednesday, cancelled the trip, an official in his office said. 
 
 A Saudi-born Syrian suicide bomber, widely believed to be inspired by the Islamic State of Iraq and the Levant (ISIL), detonated a bomb in the historic district of Istanbul in January, killing at least 10 people and injuring 15 others. 
 
 Turkey has become a target for ISIL, with two bombings last year blamed on the armed group in the town of Suruc near the Syrian border and in the capital, Ankara. The latter killed more than 100 people. 
 
 Violence has also escalated in the mainly Kurdish southeast since a two-year ceasefire collapsed in July between the state and the PKK armed group, which has been fighting for three decades for Kurdish autonomy. ||||| Media playback is unsupported on your device Media caption Eyewitness Natalie Galley: "I heard a huge explosion" 
 
 A large explosion in the Turkish capital, Ankara, has left at least 28 people dead and 61 injured, Turkish officials have said. 
 
 A vehicle full of explosives was detonated as military buses were passing by, according to the Ankara governor's office. 
 
 The blast happened in an area close to parliament and Turkey's military headquarters. 
 
 Deputy Prime Minister Bekir Bozdag called it an "act of terrorism". 
 
 Large plumes of smoke were seen rising from the area and witnesses said the blast was heard all over the city. 
 
 Some of the victims were civilians. 
 
 No group has so far claimed responsibility for the attack. 
 
 Turkey country profile 
 
 Turkey violence: How dangerous is instability? 
 
 Ambulances and fire engines were sent to the scene. 
 
 Security forces carried out a controlled explosion on a suspect package after the blast. 
 
 President Recep Tayyip Erdogan said Turkey was more determined than ever to use "its right to self-defence". 
 
 In a statement released several hours after the attack, he said: "Our determination to respond in kind to attacks taking place inside and outside our borders is getting stronger with such acts." 
 
 Mr Erdogan has cancelled a planned trip to Azerbaijan on Thursday, Reuters reports. 
 
 Turkish Prime Minister Ahmet Davutoglu has also cancelled a visit to Brussels on Thursday where he was due to attend meetings about the refugee crisis in Europe. 
 
 The US condemned the attack. Mark Toner from the State Department offered condolences to the families of the victims, adding: "We reaffirm our strong partnership with our Nato ally Turkey in combating the shared threat of terrorism attacks." 
 
 Turkey has been hit by a series of attacks recently, and there have been increasing concerns that the country could be targeted by another big attack. 
 
 In a separate development on Wednesday, an explosion damaged a building housing a Turkish cultural centre near the Swedish capital Stockholm, local officials said. No-one was injured. 
 
 It was not clear if the incident was linked to the Ankara blast. 
 
 'Dark mood across Turkey' - by Selin Girit, in Istanbul 
 
 Image copyright EPA Image caption Large plumes of smoke were seen rising from the scene of the blast 
 
 "Enough is enough! Do not kill any more! Do not make the people of this country sad anymore…" 
 
 Just one tweet summarising the dark mood across Turkey. 
 
 Hundreds of people have been offering their condolences to the relatives of the dead, condemning the attack, posting pictures and videos of the aftermath of the scene on social media. 
 
 The attack targeted a shuttle bus carrying military personnel, and there were several other military vehicles nearby - all of which were waiting at the traffic lights. Most of the casualties are believed to be soldiers. 
 
 The Turkish army strongly condemned the attack and called this "a treacherous terror act". The government and the opposition parties have also strongly condemned the incident. 
 
 In October, more than 100 people were killed in simultaneous explosions targeting a peace march in Ankara. That attack had polarised society further. 
 
 Whether Turkey can unify in pain this time round is yet to be seen. 
 
 It is not clear who was behind the blast in Ankara; security sources blamed both so-called Islamic State (IS) and militants from the banned Kurdistan Workers Party (PKK), Reuters reported. 
 
 A government spokesman said the attack had been well planned. 
 
 Recent attacks in Turkey 
 
 January 2016 : At least 10 people, mostly German tourists, are killed in a suspected IS suicide bombing in Istanbul 
 
 : At least 10 people, mostly German tourists, are killed in a suspected IS suicide bombing in Istanbul October 2015 : More than a hundred people are killed in a double-suicide bombing at a Kurdish peace rally in Ankara 
 
 : More than a hundred people are killed in a double-suicide bombing at a Kurdish peace rally in Ankara July 2015: In the predominantly Kurdish town of Suruc, near the Syrian border, over 30 people are killed in a suicide bombing, again blamed on IS 
 
 The PKK has been fighting for autonomy for Turkey's Kurdish minority for decades and has carried out regular attacks on Turkish security forces. 
 
 The blast in Ankara comes as Turkey steps up its involvement in the conflict in neighbouring Syria. 
 
 It has been shelling the Kurdish YPG militia in northern Syria, who it sees as allied to the PKK. 
 
 Turkey has also allowed the coalition bombing IS to use one of its air bases. 
 
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– A suspected car bomb rocked the Turkish capital of Ankara today, and al-Jazeera cites reports claiming that at least two people were killed. No one has yet claimed responsibility, but Kurdish rebels have been escalating their decades-long fight for autonomy and attacking Turkish targets. Rebel groups, as well as Islamic and leftist militants, have all previously used bombs in the country. Reports of casualties are conflicting: The AP reports none, but says 15 were injured, including three seriously. Reuters, meanwhile, acknowledges the reports of two deaths but quotes a local mayor who says no one has died, but that three have been seriously injured. A local news agency has reported that a woman was detained near the scene. “I felt the blast effect of the explosion some 500 meters away,” says one witness. “I saw vehicles on fire and an injured man said people lost their limbs.”