U.K. tour operator Thomas Cook has reported a 5 percent drop in overall summer bookings due to terrorist attacks in Brussels and weak demand for holidays in Turkey as the country is rocked by terrorist attacks and a failed political coup.

Group revenue in the third quarter was £1,85 billion ($2.4 billion), down 8 percent from the previous quarter, "reflecting (the) impact of Turkey and Brussels," the travel company said as it reported an underlying operating profit of £2 million in the third quarter, £22 million lower than last year.