British police have arrested a ¡°large part of the network¡± behind this week¡¯s Manchester suicide bombing but more arrests are likely, the country¡¯s top counterterrorism officer said on Friday.

Mark Rowley said ¡°immense¡± progress had been made in the investigation into Salman Abedi, who killed 22 people, seven of them children, at a pop concert in Manchester on Monday.

¡°They¡¯re very significant, these arrests. We¡¯re very happy we¡¯ve got our hands around some of the key players that we are concerned about. But as I say, there is still a little bit more to do,¡± Rowley told broadcasters.