Somali pirates have seized a Mongolian-flagged bulk carrier off the coast of Oman, the European Union Naval Force for Somalia (EU Navfor) said on Thursday, according to Reuters. EU Navfor said the pirates hijacked MV Hoang Son Sun about 520 nautical miles southeast of the port of Muscat. "The 22,835-tonne bulk carrier, which is Mongolian flagged and Vietnamese-owned, has a crew of 24 Vietnamese nationals. No further details of the attack are known at this stage," EU Navfor said in an online statement. EU Navfor reported the ship was not registered with the Maritime Security Centre for the Horn of Africa, and had not reported to the UK Maritime Trade Operation. Both help vessels keep contact with a flotilla of warships patrolling the lucrative waters linking Europe with Asia.