British police on Saturday released surveillance-camera images of the Manchester concert bomber<\/b>
\nAuthorities said they had made major progress in unravelling the plot behind the concert bombing but acknowledged there were still gaps in their knowledge.
Britain reduced its terrorism threat level a notch Saturday, from \u201ccritical\u201d to \u201csevere, \u201d yet security remained high as jittery residents tried to enjoy a long holiday weekend. Armed police officers and soldiers were deployed at soccer matches, concerts and other big events.
Abedi, a 22-year-old Briton of Libyan descent, died in Monday\u2019s explosion, which killed 22 others and wounded nearly 120 as crowds were leaving an Ariana Grande concert.
The photos released by police show attacker Salman Abedi on the night of the bombing, wearing sneakers, jeans, a dark jacket and a baseball cap. The straps of a knapsack are visible on his shoulders.
Greater Manchester Police chief Ian Hopkins and Neil Basu, the national coordinator of counterterrorism policing, urged people to contact police if they had information about Abedi\u2019s movements between May 18 and Monday night.
\u201cIn the past five days, we have gathered significant information about Abedi, his associates, his finances, the places he had been, how the device was built and the wider conspiracy, \u201d they said in a statement.
\u201cOur priorities are to understand the run-up to this terrible event and to understand if more people were involved in planning this attack.\u201d
British Prime Minister Theresa May said \u201ca significant amount of police activity\u201d and several arrests had led to the level being lowered. But she urged Britons to remain vigilant and said soldiers would remain at high-profile sites throughout the weekend, and start reducing their presence beginning Tuesday.
A severe threat still means an attack is \u201chighly likely, \u201d according to the scale set by Britain\u2019s Joint Terrorism Analysis Centre.
Assistant Commissioner Mark Rowley, Britain\u2019s top counterterrorism police officer, said authorities have dismantled a \u201clarge part\u201d of the network around bomber Salman Abedi.
But Rowley said there were still \u201cgaps in our understanding\u201d of the plot, as investigators probed Abedi\u2019s potential links to jihadis in Britain, Europe, Libya and the Middle East.
\u201cThere will be more arrests and there will be more searches, \u201d he said.
Police made two more arrests in Manchester on Saturday on suspicion of terrorism offenses, bringing the number of suspects in custody to 11. All are men, aged between 18 and 44. In addition, Abedi\u2019s father and younger brother were detained in Libya.
Police disclosed new details about Abedi\u2019s\u2019 movements, saying he returned to Britain four days before the attack. His father has said Abedi was in Libya until earlier this month and had told family he planned to go to Saudi Arabia on a pilgrimage.
Police say they think Abedi assembled his bomb at a rented apartment in central Manchester that was raided by officers Wednesday.
Investigators have searched 17 properties, including Abedi\u2019s home in south Manchester and other houses in nearby districts.
Residents were evacuated from streets in the south Manchester neighborhood of Moss Side in what police called a precaution as one search was carried out Saturday. Photos showed an army bomb-disposal unit at the property.
Another place searched was an apartment in a Manchester high-rise that British media say was rented by Abedi in the months before the attack. Mohammed El-Hudarey, a friend of the landlord, said after Abedi moved out about six weeks ago there was a strong smell of chemicals and debris including metal rods and cut-up fabric.
\u201cWe thought he must have been a drug dealer or doing witchcraft, \u201d El-Hudarey told the BBC.
Armed police were on the streets outside London\u2019s Wembley Stadium, and security guards conducted extra bag checks, as 90,000 fans arrived for the FA Cup soccer final between Chelsea and Arsenal, one of the biggest sporting events of the year.
Before kickoff, Prince William laid a wreath in memory of the victims alongside Manchester Mayor Andy Burnham. The stadium held a minute of silence for the bombing victims.
Arsenal fan Liz Johnson said she was \u201csad after what happened in Manchester. But I grew up in Ireland, so bombs did go off there and life does go on.\u201d
\u201cWe will be thinking about all the people who died and were injured, \u201d she said.
Manchester slowly returned to normal, though the damaged arena and adjacent Victoria train station remained closed.
Former U. S. President Barack Obama offered his condolences to the victims and support for those wounded in the Manchester bombing during a meeting Saturday with Prince Harry at London\u2019s Kensington Palace.
Britain\u2019s health service said Saturday that 63 people wounded in the bombing remain hospitalized, 20 of them in critical condition.
Grande, meanwhile, promised to return to \u201cthe incredibly brave city of Manchester\u201d to hold a benefit concert for the victims.
\u201cOur response to this violence must be to come closer together, to help each other, to love more, to sing louder and to live more kindly and generously than we did before, \u201d she said. \u201cWe won\u2019 t let hate win.\u201d
Associated Press writer Jill Lawless reported this story from London and AP writer Mstyslav Chernov reported in Manchester. AP writer Rob Harris in London contributed to this report.<\/p>\n

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