WASHINGTON, Feb. 22, 2011 – Somali pirates killed all four Americans they had held hostage aboard a sailing vessel in the Indian Ocean this morning, U.S. Central Command officials announced. U.S. officials were negotiating with the pirates for the safe return of the captured Americans when the murders took place, officials said. Centcom officials said that in the midst of negotiations, U.S. forces responded to gunfire aboard the S/V Quest. When the forces reached the boat, officials said, they discovered all four hostages had been shot by their captors. Despite immediate steps to provide life-saving care, all four hostages ultimately...