pbr Five Somalis have been convicted in a federal court in Virginia on piracy and other criminal charges over an April attack on a US Navy ship off the coast of Africa.br ppbr The five could face life in prison when they are sentenced before a federal judge on March 14.br ppbr The men were captured after the April 1 attack in which a Navy frigate, the USS Nicholas, exchanged fire with a suspected pirate vessel in the Indian Ocean west of the Seychelles, sinking a skiff and confiscating its mother ship.br ppbr The five, and a group of six Somalis captured after allegedly firing on another US warship in April, were brought to Norfolk to face charges over the two attacks. One of the six pleaded guilty in August while the case against the others remains pending.br ppbr Pirates operating off the coast of Somalia have hijacked vessels in the Indian Ocean and the Gulf of Aden for years, making millions of dollars in ransoms by seizing ships, including oil tankers, despite the presence of dozens of foreign naval vessels.