The United Kingdom Maritime Trade Operations (UKMTO) has said it received reports of two maritime incidents off Oman, including one in which a tanker was struck by an unknown projectile, Reuters reports.

In the first incident, a tanker was struck by an unknown projectile about 11 nautical miles northeast of Oman’s Lima, damaging its engine room and leaving the vessel not under command, UKMTO said. There were no reported casualties nor environmental impact, it added.

Later, UKMTO said it had received a second report of an incident, 21 nautical miles northeast of Oman’s Khasab. The master of a tanker reported seeing a large splash and an explosion in close proximity to the vessel, though no damage was reported.

Lima and Khasab are on Oman’s Musandam Peninsula at the entrance to the Strait of Hormuz, a strategic shipping chokepoint through which about a fifth of global oil consumption passes.