Hong Kong Police arrest 7 people on suspicion of breaching new security law

Hong Kong Police said on Monday they had arrested seven people on suspicion of breaching the city's new national security law for offences including collusion with foreign powers.

READ: 5 ways Hong Kong has changed under China's security law

Police said the operation was still ongoing and further arrests possible.

READ: Hong Kong in tumult over national security law

Hong Kong media tycoon Jimmy Lai was arrested, his top aide said on Twitter on Monday, in what is the highest-profile arrest yet under the legislation.