"Very important" items have been found in property searches after the Manchester attack and "significant" arrests have been made, say police.
Eight men are currently in custody, including the bomber's older brother.
Two more people were arrested overnight in Greater Manchester, following other raids and arrests on Wednesday in Manchester, Wigan and Nuneaton in Warwickshire.
Chief Constable Ian Hopkins told reporters: "The arrests that we have made are significant, and initial searches of premises have revealed items that we believe are very important to the investigation."