Four Americans whose yacht was hijacked last week by Somali pirates off the coast of Oman have been killed.
The U.S. Central Command said negotiations were underway between the U.S. Navy and the pirates, when the U.S. forces heard gunfire coming from the boat.
They boarded the ship, killing two pirates, and discovered the four Americans shot. Thirteen other pirates were captured.
Pirates have increased attacks off the coast of East Africa in recent years despite an international flotilla of warships dedicated to stop the pirate assaults.
compiled from agency reports