An incident occurred Friday aboard a crude oil tanker sailing about 4 nautical miles (5 statute miles) east of Oman. An unidentified object struck the vessel’s port side.

The United Kingdom Maritime Trade Operations (UKMTO) said the tanker’s captain reported the incident and that all crew members aboard were safe. No environmental impact from the incident was reported.

As authorities continued investigating the nature of the incident, UKMTO urged vessels passing through the area to exercise caution and report any suspicious activity.