<p>U.S. intelligence and security officials fear attacks by Muslim U.S. soldiers opposed to the war in Iraq in the wake of a fatal grenade attack in Kuwait blamed on a Muslim soldier in the Army.</p>
<p>"There is concern that this may not be an isolated incident," said one intelligence official familiar with the investigation of Sgt. Asan Akbar, a member of the 101st Airborne Division who is charged with killing two U.S. soldiers in a grenade attack.</p>