With its capital under curfew following devastating Easter Sunday bomb attacks on churches and upmarket hotels, Sri Lanka is filled with fear, horror and grief and tourists who have been flocking to the Indian Ocean island could cancel in droves.

A tweet posted on the travel booking website First Choice captured the trepidation among holidaymakers, while some airlines and travel agents said they would waive cancellation charges for people scheduled to travel imminently.

"What are you doing about the holidays you have booked to that country?" tourist Judith Ann Clayton asked on the social media site.