The property in Fallowfield where Abedi lived was raided on 23 May. Armed police breached the house with a controlled explosion and searched it.
Abedi's 23-year-old brother was arrested in Chorlton-cum-Hardy in south Manchester in relation to the attack.
Police carried out raids in two other areas of south Manchester and another address in the Whalley Range area.
Three other men were arrested, and police initially spoke of a network supporting the bomber; they later announced that Abedi had sourced all the bomb components himself, and that they now believed he had largely acted alone.
On 6 July, police said that they believed others had been aware of Abedi's plans.
 
According to German police sources, Abedi transited through Düsseldorf Airport on his way home to Manchester from Istanbul four days before the bombing.
French interior minister Gérard Collomb said in an interview with BFM TV that Abedi may have been to Syria, and had "proven" links with ISIS.
Abedi's younger brother and father were arrested by Libyan security forces on 23 and 24 May respectively.
The brother was suspected of planning an attack in Libya, and was said to be in regular touch with Salman, and aware of the plan to bomb the Manchester Arena, but not the date.
According to a Libyan official, the brothers spoke on the phone about 15 minutes before the attack was carried out.
On 1 November 2017, the UK requested Libya to extradite the bomber's younger brother, Hashem Abedi to return to the UK to face trial for complicity in the murder of the 22 people killed in the explosion.

Photographs of the remains of the IED published by The New York Times indicated that it had comprised an explosive charge inside a lightweight metal container which was carried within a black vest or a blue Karrimor backpack.
Most of the fatalities occurred in a ring around the bomber.
His torso was propelled by the blast through the doors to the arena, possibly indicating that the explosive charge was held in the backpack and blew him forward on detonation.
A small device thought to have possibly been a hand-held detonator was also found.
US Congressman Michael McCaul, chairman of the House Homeland Security Committee, indicated that the bomb contained the explosive TATP, which has been used in previous bombings.
According to Manchester police, the explosive device used by Abedi was the design of a skilled bomb-maker and had a back-up means of detonation.
Police also said Salman Abedi "bought most of Manchester bomb components himself" and that he was alone during much of the time before carrying out the Manchester bombing.

On 28 May, police released images showing Abedi on the night of the bombing, taken from CCTV footage.
Further images showed Abedi walking around Manchester with a blue suitcase.

According to US intelligence sources, Abedi was identified by the bank card that he had with him and the identification confirmed using facial recognition technology.

A total of 22 people were arrested in connection with the attack, but had all been released without charge by 11 June following the police's conclusion that Abedi was likely to have acted alone, even though others may have been aware of his plans.
The property in Fallowfield where Abedi lived was raided on 23 May. Armed police breached the house with a controlled explosion and searched it. Abedi's 23-year-old brother was arrested in Chorlton-cum-Hardy in south Manchester in relation to the attack. Police carried out raids in two other areas of south Manchester and another address in the Whalley Range area. Three other men were arrested, and police initially spoke of a network supporting the bomber; they later announced that Abedi had sourced all the bomb components himself, and that they now believed he had largely acted alone. On 6 July, police said that they believed others had been aware of Abedi's plans.  
According to German police sources, Abedi transited through Düsseldorf Airport on his way home to Manchester from Istanbul four days before the bombing. French interior minister Gérard Collomb said in an interview with BFM TV that Abedi may have been to Syria, and had "proven" links with ISIS. Abedi's younger brother and father were arrested by Libyan security forces on 23 and 24 May respectively. The brother was suspected of planning an attack in Libya, and was said to be in regular touch with Salman, and aware of the plan to bomb the Manchester Arena, but not the date. According to a Libyan official, the brothers spoke on the phone about 15 minutes before the attack was carried out. On 1 November 2017, the UK requested Libya to extradite the bomber's younger brother, Hashem Abedi to return to the UK to face trial for complicity in the murder of the 22 people killed in the explosion.
Photographs of the remains of the IED published by The New York Times indicated that it had comprised an explosive charge inside a lightweight metal container which was carried within a black vest or a blue Karrimor backpack. Most of the fatalities occurred in a ring around the bomber. His torso was propelled by the blast through the doors to the arena, possibly indicating that the explosive charge was held in the backpack and blew him forward on detonation. A small device thought to have possibly been a hand-held detonator was also found. US Congressman Michael McCaul, chairman of the House Homeland Security Committee, indicated that the bomb contained the explosive TATP, which has been used in previous bombings. According to Manchester police, the explosive device used by Abedi was the design of a skilled bomb-maker and had a back-up means of detonation. Police also said Salman Abedi "bought most of Manchester bomb components himself" and that he was alone during much of the time before carrying out the Manchester bombing.
On 28 May, police released images showing Abedi on the night of the bombing, taken from CCTV footage. Further images showed Abedi walking around Manchester with a blue suitcase.
According to US intelligence sources, Abedi was identified by the bank card that he had with him and the identification confirmed using facial recognition technology.
A total of 22 people were arrested in connection with the attack, but had all been released without charge by 11 June following the police's conclusion that Abedi was likely to have acted alone, even though others may have been aware of his plans.
Manchester Arena bombing