Shares in London-listed holiday firms have taken a tumble after the terrorist attacks in Tunisia on Friday which left more than 30 dead, many of them British tourists.
Shares in the package holiday company Thomas Cook fell as much as seven per cent to 133.026 pence per share in early trading, recovering slightly to 139.93 pence per share at pixel time.
Meanwhile, Tui was the FTSE 100's biggest faller. Shares in the owner of Thomson and First Choice, which have both cancelled all holidays to Tunisia, tumbled as much as 10 per cent to 996.74 pence per share as markets opened, trading at 1047.26 pence per share at pixel time.
Airlines also slipped with EasyJet and British Airways owner IAG shares edging around three per cent lower on Monday morning.
David Cameron has called the fight against IS, the Islamic group responsible for the attacks, the "struggle of our generation" and, speaking to the BBC, said it would take "a very long time" to beat them as he prepares for a second meeting of the government's emergency Cobra committee.