DUBAI, United Arab Emirates (AP) — An oil tanker off the coast of Oman has been struck by a bomb-carrying drone amid heightened tensions with Iran, an official told The Associated Press on Wednesday.

The attack happened Tuesday night off the coast of Oman, the Mideast-based defense official said. The official spoke on condition of anonymity as they did not have authorization to discuss the attack publicly.

The United Kingdom Maritime Trade Operations, a British military organization in the region monitoring shipping, told the AP: “We are aware of an incident and it’s being investigated at this time.”