Tui Group has reported that its profits will be hit after the terrorist attack in Tunisia in late June.
All but five of the 38 people who were killed in the attack were on a Tui holiday, when a man opened fire on the beach.
The travel operator, which owns Thomson and First Choice Travel, said in its third quarter results, around £20 million will be knocked off their annual profits.
The government issued a warning about travelling to Tunisia after the attack.
"This is the most tragic event and loss of human life that I have ever had to deal with or my company and we remain deeply shocked in terms of the loss of life, those customers that were injured and all the trauma that our customers had to go through, through these terrible events," Tui Group chief executive Peter Long told the BBC.
"We were 100% focused on making sure that our customers were looked after and that was our number one priority."
TUI is now relying on Foreign Office advice for when to begin offering holidays in Tunisia once more.
In the three months to the end of June, the attack had cost the business about €10 million ($11 million; £7 million) in repatriation and cancellation costs.
Tui’s profits have also been hit by the continued economic chaos in Greece, however they said that business had been resilient and summer bookings were still ahead of last year's.
