Detectives have made "immense" progress in the investigation into the Manchester bombing and are confident they have arrested some "key players", Britain's top counter-terror officer has said.
Assistant Commissioner Mark Rowley said police have made "significant" arrests and "finds" and have got hold of a "large part of the network" being sought over the atrocity.
Mr Rowley said: "They are very significant, these arrests.
"We are very happy we've got our hands around some of the key players that we are concerned about but there's still a little bit more to do."
Fresh raids were carried earlier today as security services brace for more attacks during the Muslim holy month of Ramadan beginning tomorrow.
Islamic State has called on its followers to rise up in an “all-out war” on "infidels” in the West. Saturday marks the start of a 30-day period of fasting and reflection in the Islamic world, which has in recent years seen a large increase in terror attacks.
As detectives revealed the youngest man in custody over the Manchester attack is 18, early-hours searches were on Friday launched at a Manchester barbershop and a takeaway on Merseyside.
Officers who earlier raided terrorist Salman Abedi's home discovered a working bomb factory with a huge stash of explosive chemicals and other components.
