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The UK's terror threat level has been reduced from critical to severe, Theresa May has said.
This means the likelihood of an attack is highly likely rather than imminent.
Operation Temperer, which allows the military to be deployed to key sites, will continue until the end of the Bank Holiday, the Prime Minister said.
Speaking after a meeting of the Government's Cobra emergency committee, Mrs May said the decision had been taken after "a significant amount of police activity" over the last 24 hours.
She said: "The public should be clear about what this means - a threat level of severe means an attack is highly likely. The country should remain vigilant."
Greater Manchester Police have said they "had been searching" two address in the Cheetham Hill and Longsight areas of Manchester.
The update came early on Saturday, but no further information was immediately available.
The searches are part of the ongoing investigation into the Manchester Arena attack.
A 44-year-old man has been arrested in Rusholme on suspicion of terrorism offences in connection with the Manchester bombing, police said.
His arrest brings the total number detained to 11, Greater Manchester Police said.
Of those, two people have since been released without charge.
Latest ITV News reports
New CCTV of the Manchester bomber Salman Abedi has been released by police.