(Reuters) – Authorities lifted a curfew in Sri Lanka on Monday, a day after a string of bombings at churches and luxury hotels across the Indian Ocean island killed 290 people and wounded about 500, but there were warnings more attacks could come.

There was no claim of responsibility for the Easter Sunday attacks on two churches and four hotels in and around Colombo, the capital of predominantly Buddhist Sri Lanka, and a third church on the South Asian nation’s northeast coast. Four of the bombs went off at roughly the same time, at 8.45 a.m., with the other two coming within 20 minutes.

Sri Lankans accounted for the bulk of the dead and wounded although government officials said 32 foreigners were killed, including British, U.S., Turkish, Indian, Chinese, Danish, Dutch and Portuguese nationals.

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President Maithripala Sirisena, who was abroad when the attacks happened, had called a meeting of the National Security Council early on Monday, a government source said. Prime Minister Ranil Wickremesinghe would attend the meeting, the source said.

The Sri Lankan military, who were clearing the route from Colombo airport late on Sunday in preparation for Sirisena’s return, found a crude bomb near the departure gate, an air force spokesman said.