Security was tight as 40,000 runners pounded Manchester's streets in the annual half marathon (21.1 km) a day after Prime Minister Theresa May lowered the terror threat level, which was hiked following Monday's carnage.
Investigators gave details of Abedi's last hours as they released photographs from security cameras showing the black- clad suicide bomber wearing jeans and trainers, a black bodywarmer and baseball cap, the straps of his backpack visible on his shoulders.
The police statement said one of the last places he went to was a "city centre flat and from there he left to make his way to the Manchester Arena" where the attack took place.
"The flat is highly relevant as a location which we believe may be the final assembly place for the device."
Two unarmed police officers remained on guard outside the entrance to Granby House, believed to contain the flat in question, according to an AFP correspondent at the scene.
"It is surprising because these people are just under your nose and you don't know it," said Harpreet Lota, a Manchester resident walking past the building.
Along with the 11 suspects in UK custody, police in Libya have detained Abedi's father and brother.
A third of those killed in Monday's bombing were children, and another 116 people were injured.
The attack, which has been claimed by the Islamic State jihadist group, targeted young fans at the end of a concert by US teen pop idol Ariana Grande.
British counter-terror chief Mark Rowley said Friday that police had captured "a large part of the network" linked to the bombing.
"We should be clear about what this means: A threat level of severe means an attack is highly likely, the country should remain vigilant," she said.
Operation Temperer, which involved the deployment of troops on patrol alongside police, will be wound down on Monday night, at the end of the bank holiday weekend.
"From midnight on Monday, there will be a well-planned and gradual withdrawal of members of the armed forces, who will return to normal duties," she said.
Competitors fell silent as the clocks struck 9:00, followed by sustained applause as Oasis song "Don't Look Back In Anger" played over the tannoy, sparking a sing-a-long.
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