The Sri Lankan police, in collaboration with paramilitary specialists and army units, found explosives during a house search in Sammanthurai, in the Ampara district in the Eastern Province. According to local media, seven people have been arrested.
Images from the digital channel Newsfirst show a large amount of material that can be used to make bombs.
There were also several jerry cans with fuel, bars of gelatin dynamite, thousands of metal balls, ignition mechanisms and a drone.
A few of the many agents hold up a black flag with white signs, possibly a symbol of Islamic State.
This terror organisation may be behind the massacre that was caused during Easter in hotels and churches. In total, more than 250 people died.
In Sainthamaruthu, a little further on the coast, a few explosions have been reported almost simultaneously.
Shots were also fired. A police spokesman told Newsfirst that the firefight arose during a raid on a building that was possibly used to fabricate bomb belts.
In connection with these developments and searches, a nightlife ban has been set for the whole of Sri Lanka from 10 a.m. (local time) to 4.00 a.m. on Saturday morning.