Gunmen have attacked tourist hotels in the Tunisian town of Sousse killing at least seven people in the process.
The country’s interior ministry said two hotels were targeted.
Photographs have been seen by Sky News showing a man in his 60s or 70s lying in a pool of blood in his swimming shorts.
Tour operator Thomson is one of the UK-based travel firms which offers holidays at hotels in the town, but it is unclear which hotel has been targeted.
British tourist David Schofield told Sky News that he was by the pool when he heard “quite a large explosion” and guests started to run back towards the hotel.
“We heard people saying there were guns on the beach. People were shooting on the beach,” he said.
“People are running around the hotel. No-one has really been told what to do.”
Another, John Yeoman, has barricaded himself inside his hotel room using a bed and chair.
At least one gunman has been killed, according to security sources cited by the Reuters news agency.
Casualties have been reported.
Another holidaymaker, Susan Ricketts, said: “It sounded like a machine gun going off.
“There are people crying and going hysterical. We just came up to our room.
“They’re saying it’s going on in the hotel next to us. It’s just a stretch of hotels along here. There’s nothing else.”
Meanwhile deadly explosions have hit a Shiite mosque in Kuwait’s capital after Friday prayers.