TUNIS, Tunisia (AP) — An international activist group seeking to deliver aid to Gaza on a flotilla says one of its boats was hit by what it believes was a drone while docked in Tunisia. Tunisian authorities denied a drone was involved and said they are investigating a fire in a life jacket aboard the boat.

Tunisian authorities said the explosion came from inside the vessel, rejecting the claim it was hit off the country’s coast.

Leaders of the flotilla say the fire was caused by a drone but Tunisian authorities say the claims are not true.