Pirates boarded a tanker in the Gulf of Aden early Thursday, according to a VHF report received by Greek maritime media Naftemporiki.
The incident occurred at 06:20 UTC at coordinates 13°36.5'N, 048°34.6'E, located north of the International Recommended Transit Corridor (IRTC).
Details regarding the vessel's flag, cargo, or the status of the crew were not immediately available.
The attack underscores the persistent security threat facing commercial shipping in the Red Sea and Gulf of Aden.
While the IRTC was established to provide a safer passage for vessels, incidents outside the corridor highlight the difficulty of fully securing the region.
The event adds to a series of disruptions that have kept insurance premiums elevated and forced many carriers to reroute around the Cape of Good Hope, increasing transit times and costs.