Manchester attack: Bomber Abedi 'built device alone at flat' Published duration 12 June 2017 Related Topics Manchester Arena attack

image copyright GMP image caption New images released by police show bomber Salman Abedi on CCTV in Manchester

Manchester bomber Salman Abedi was likely to have built the device that killed 22 people alone at his flat, police have said.

Officers said there was now a "deep understanding" of Abedi's movements in the weeks leading up to the attack.

The head of counter terrorism said it was "less clear" whether he had obtained and stored all the materials or if others were "complicit".

All 22 people arrested over the attack have been released without charge.

Det Ch Supt Russ Jackson said Greater Manchester Police now had details of Abedi's movements in the weeks leading up to the Manchester Arena bombing.

These included how the chemicals to build the bomb were obtained and where he put the device together.

Police said they had an understanding of Abedi's movements "almost hour by hour" in the days before he bombed Manchester Arena on 22 May.

They said:

Abedi, 22, bought a white Nissan Micra on 13 April - two days before leaving the UK for a month-long trip to Libya

He used the car to store bomb parts and was captured on CCTV putting plastic barrels into the vehicle

He returned to the UK on 18 May, with police saying he seemed "intent on committing the attack within days"

CCTV footage shows him purchasing more items for the bomb, including nuts from a DIY store that were used for shrapnel, as well as the tin in which the explosive was believed to have been put in

He was tracked going to and from flats in the Banff Road area of Rusholme, where the Micra was parked

Detectives believe he was collecting pre-prepared bomb parts from the car for him to assemble - alone - at his flat

But understanding "whether others knew or were complicit in the storage of materials knowing what was being planned" is "crucial to our work"

image copyright GMP image caption Images released by Greater Manchester Police show a barrel which was stored in Salman Abedi's car

Early in the investigation, GMP said it could be looking for a "network" of people in connection with the attack, but all of those arrested so far have now been released.

Two were quickly de-arrested, but the other 20 were interviewed multiple times about their contact with Abedi.

Det Ch Supt Jackson said they had uncovered "a number of suspicious purchases" of materials, which could be used to make bombs, as well as contact with the attacker.

'Innocent contact'

Some of those arrested gave accounts of "innocent contact" with Abedi and police were "satisfied with these explanations".

He added: "We said at the start we had to rapidly understand whether this was an attack committed by an isolated individual or a wider network.

"We have made enormous progress in this and are far more confident on who was not involved and who could still be involved."

image copyright GMP Handout image caption Police are appealing for anyone who saw Salman Abedi (pictured) with his white Nissan Micra

Officers are continuing to search a landfill site in Bury, Greater Manchester, for a blue suitcase that Abedi was seen using days before the attack - it is believed to contain items discarded after the bomb device was assembled.

They said they had "found evidence of explosive material at several locations" after searching 29 premises that had links to Abedi.

Police also want to talk to Abedi's younger brother, Hashem, who left the country on the same day as his brother and is being detained in Libya.

Assistant Commissioner Mark Rowley said the pace of the inquiry, which is one of GMP's largest investigations, was "incredible and will continue in the coming weeks and months".

More than a thousand officers have been working on the investigation, which has seen the seizure of about 700 media devices, including phones, and more than 8,000 entries on the police's logging system.

image caption Police are continuing to search a landfill site in Bury

Det Ch Supt Jackson appealed again for anyone who may have seen Abedi in the days before the attack to come forward - especially those who saw him with the car or putting materials into it.

"This is very much a live criminal investigation moving at considerable speed," he added. "It is a terrorism investigation relating to 22 murders and multiple attempted murders.