A unit of the state-owned Abu Dhabi National Oil Company (Adnoc) says one of its tankers, struck by Iranian drones last week, has leaked a small amount of fuel off the coast of Oman, underscoring the ecological risks stemming from the Iran war, Reuters reports.

Adnoc Logistics and Services says it is monitoring the situation concerning the vessel, the MV Barakah, and is working “closely with the relevant authorities and specialist response teams”.

“The Adnoc Logistics and Services vessel Barakah remains at anchor off the coast of Oman after being impacted by two Iranian drones on May 4,” a company spokesperson says. “A small amount of what is understood to be bunker fuel was unfortunately released as a result of the incident.”

The spokesperson has not said how much fuel is believed to have leaked.

At the time of the attack, Adnoc said no crew members were injured, and the tanker was not carrying any cargo.

Oman’s Maritime Security Centre did not immediately respond to a request for comment.