The U.S. State Department on Sunday issued a revised warning on travel to Sri Lanka and said terror groups are continuing to plot and possibly carry out new attacks in hotels and churches.

On Easter Sunday, a series of bombs exploded at churches and luxury hotels in the country, killing nearly 300. It was the deadliest series of attacks the South Asian island country had seen since a bloody civil war there ended a decade ago. Most of the attacks occurred in or around Colombo, the capital. The U.S. said “several” Americans were among the dead.

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The State Department said that possible targets include tourist locations and transportation hubs, according to Reuters. The alert said terrorists “may attack with little or no warning.”