Holidaymakers have been warned that “terrorist groups” are plotting further attacks in Sri Lanka after Easter Sunday’s deadly blasts.
Possible targets include popular tourist sites, transportation hubs, shopping malls, restaurants, hotels, airports, places of worship and other public areas.
The US State Department said in a revised travel advisory that visitors should exercise increased caution due to terrorism after 290 people were killed and about 500 wounded in blasts in churches and luxury hotels.
“Terrorists may attack with little or no warning,” it said in a revised warning for holidaymakers.
Five Brits are among the dead, though their identifies have yet to be officially confirmed.
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The Foreign Office has told Britons in Sri Lanka to follow the advice of local security authorities, hotel security staff or their tour company.
Australia’s Foreign Affairs department has told holidaymakers to reconsider their need to travel to Sri Lanka “due to the high level of risk”.
There was still no claim of responsibility for the attacks in and around Colombo, the capital of predominantly Buddhist Sri Lanka, and a third church on the South Asian nation’s northeast coast.
A government analyst confirmed on Monday that the attacks at three churches and three hotels were carried out by suicide bombers.
A government source said President Maithripala Sirisena, who was abroad when the attacks happened, had called a meeting of the National Security Council.
Sri Lankan military who were clearing the route from Colombo airport late on Sunday in preparation for Sirisena’s return found a homemade bomb near the departure gate, an air force spokesman said.
They disposed of the device in a controlled explosion, the spokesman said.
There were fears the attacks could spark a renewal of communal violence, with police also reporting late on Sunday there had been a petrol bomb attack on a mosque in the northwest and arson attacks on two shops owned by Muslims in the west.
Sri Lanka was at war for decades with Tamil separatists but extremist violence had been on the wane since the civil war ended 10 years ago.
The South Asian nation of about 22million people has Christian, Muslim and Hindu populations of between about eight and 12 percent.