Indian Navy stealth frigate INS Tabar has successfully repulsed an attack by pirates off the Somali coast and sunk their ship, an official said in New Delhi on Wednesday. The Indian Navy ship was fired at by pirates in the Gulf of Aden late Tuesday. "The pirates fired at INS Tabar, which is patrolling the waters off the Somali coast. The ship retaliated and sank the pirate vessel," a Navy official said.