A United States Army sergeant was convicted by a military jury today of premeditated murder and attempted murder in a grenade and rifle attack that killed two of his comrades and wounded 14 others in Kuwait during the opening days of the Iraq war. Hasan Akbar, 33, now faces a possible death penalty, which the 15-member jury will consider at a hearing that begins Monday. Prosecutors at Fort Bragg, North Carolina, said Akbar told investigators he launched the attack because he was concerned US troops would kill fellow Muslims in Iraq.