A Danish ship came under fire in a pirate attack in the Gulf of Aden on Tuesday, but managed to escape after a Russian warship came to its aid.
The shipping company, AP Moeller Maersk, says the container vessel Nedlloyd Barentsz was chased for half an hour by six pirates aboard a small speedboat.
Two rocket-propelled grenades were fired at the ship, but missed their targets.
The company says the ship increased speed, began evasive manoeuvres and radioed for help. A Russian vessel heard the signal and quickly reached the scene.
The Piracy Reporting Centre in Kuala Lumpur says pirates operating in the Gulf of Aden and along the Somali coast currently hold 11 ships with 210 crew members as hostages.