About 350 protesters from  organizations in Cyprus have gathered in front of the entrance gate of a British air base to denounce U.S.-led airstrikes against suspected chemical weapons sites in Syria.

Protest leader Akis Poullos says they are demanding the closure of RAF Akrotiri, from where four British Tornado warplanes took off to take part in the missile strike.

Poullos said Sunday’s demonstration was also a message to the Cyprus government not to lend any assistance to “imperialist attacks” on Syria and to demand an end to the war in the country.

Protesters used red paint to write “NATO killers go home” on a nearby wall outside the base’s gate.

Former colonial ruler Britain retained RAF Akrotiri and another military base on Cyprus after the east Mediterranean island gained independence in 1960.

The Cyprus government said it wasn’t given any forewarning about Saturday’s airstrikes. It also said British Prime Minister Theresa May assured Cypriot President Nicos Anastasiades that there’s no danger to Cyprus and that Cypriots can feel secure.