Detectives investigating dissident republican activity have arrested four men in west Belfast and recovered a firearm and ammunition
A suspect aged 29 was detained on the Grosvenor Road last night after a vehicle was stopped. An assault rifle is being examined.
In a follow-up operation three men aged 27, 29 and 46 were arrested in the Springfield Road area.
Police Service of Northern Ireland (PSNI) Detective Superintendent Kevin Geddes said the suspects are being questioned at Antrim police station and police inquiries are continuing.
Detective Chief Inspector John McVea, from the Serious Crime Branch, confirmed that the 27-year-old is also being questioned as part of the investigation into the grenade attack on police in North Belfast last Sunday night.