https://www.bbc.com/news/world-asia-48074702
Sri Lankan police say they exchanged fire with an armed group in the east of the country as they searched for those linked to last Sunday's bombings.
A military spokesman said there was also an explosion as police conducted a raid in the town of Ampara Sainthamaruthu, near Batticaloa.
In a separate raid nearby, police said explosives and uniforms of the Islamic State (IS) group were seized.
Earlier, Sri Lanka's PM said warnings of the attacks had not been passed on.
Ranil Wickremesinghe told the BBC he had been "out of the loop" and that vital intelligence warnings had not been passed to him.
In Ampara Sainthamaruthu on Friday, police said officers acting on a tip-off had launched a raid and that an armed group had set off an explosion. A gun battle then ensued.
Details were sketchy but Sri Lankan media said one civilian had died as well as several suspected militants.
In another raid in the same town police found IS uniforms, 150 sticks of gelignite, 100,000 metal balls and a drone camera, a military spokesman said.
Police quoted by local media said 10 arrests were made across the country on Friday bringing the number detained since last Sunday to 80.
President Maithripala Sirisena has told reporters that intelligence services believed about 130 suspects linked to IS were in the country and that police were hunting 70 who were still at large.