A Malta-flagged, Bulgarian-owned bulk carrier was reportedly boarded on Thursday after being involved in an incident in the Arabian Sea off Yemen’s Socotra Island, British maritime security company Ambrey said in an advisory note.

An Iranian-flagged fishing vessel in the area had switched off its AIS transponder six hours before the incident close to where the bulk carrier appeared to come adrift, Ambrey said.

“The Iran-flagged fishing vessel had previously been operating offshore Somalia,” Ambrey added.

The United Kingdom Maritime Trade Operations (UKMTO) agency also sent an advisory saying it had received a report of a distress call from a vessel being boarded by unknown persons east of Bossaso, Somalia. UKMTO map located the incident near the Arabian Sea off Yemen’s Socotra Island, as the map showed.