There were no further details on what was targeted, police said.
St. Anthony's Shrine, a Catholic church in Colombo, and Zion Church, in Batticaloa, were also attacked. The church posted photos of the attack on its Facebook page and pleaded for relatives to "come and help if your family members are there".
"The Ministry is closely following the situation in Sri Lanka", a spokesperson for the Foreign Affairs Ministry told Lovin Malta.
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"We are now investigating the global support for them, and their other links, how they produced the suicide bombers here, and how they produced bombs like this". An eighth blast in a suburb in the north of Colombo followed shortly after, reportedly killing three police officers.
Six almost simultaneous explosions happened at churches and hotels in Colombo, Negombo and Batticaloa on Easter Sunday.
Meanwhile, Sri Lankan President has announced that the country will impose an island-wide curfew starting Sunday from 6pm local time finishing at 6am local time on Monday morning, as reported by CNN.
The explosions occurred as worshipers attended Easter services, said the police.
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Bomb blasts in the capital Colombo were common a decade ago when Sri Lanka was at war with Tamil separatists.
The three hotels hit were the Shangri-La Colombo, Kingsbury Hotel and Cinnamon Grand Colombo, all located in Colombo, the country's largest city, and frequented by foreigners including Japanese.
Who was behind the attacks?
Prime Minister Ranil Wickremesinghe called a national security council meeting at his home later in the day.
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Foreign Secretary Jeremy Hunt said that he was "deeply shocked" by the attacks, adding that "to target those gathered for worship on Easter Sunday is particularly wicked".