Colombo, Sri Lanka (CNN) Sri Lankan security forces imposed an extended curfew Friday in several cities as they continue searching for suspects linked to the Easter Sunday bombings.

The eastern cities of Kalmunai, Chavalakade and Samanthurai will be under a daily curfew from 8:45 p.m. to 4 a.m. until further notice, police said.

Authorities announced the curfew after security forces were involved in a shootout and seized bomb-making equipment during raids those cities.

A cache of explosives was seized from a house in Samanthurai, following a raid on intelligence information, police said. Security forces also found ISIS uniforms, flags, 150 sticks of explosive Gelignite, 100,000 ball bearings and a drone camera.

Three explosions were reported in nearby Kalmunai. Security forces exchanged fire during a security operation in the Sainda-Marudu area of the city, police said.

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