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.
New CCTV of the Manchester bomber Salman Abedi has been released by police.
The younger brother of the Manchester bomber has said Salman Abedi was radicalised online in Britain.