Somali pirates have seized a German-owned cargo ship, the MV Charelle, off the coast of Oman, a NATO commander said.

The attack, which occurred Friday evening, marks the first recorded attack in Omani territorial waters, NATO Lt. Cmdr. Alexandre Fernandes told FOX News.

NATO has not determined how many crew members are onboard the MV Charelle, Fernandes said. Six suspected pirates were believed to be onboard the ship.

"The Charelle is now heading southwest towards Somalia," Fernandes told Reuters. "This is the first case of armed robbery outside the normal operations area of the pirates."

NATO has not had any contact with the cargo ship.

A merchant ship, the Eli Maersk, first reported the hijacking to NATO.