The United States, using military helicopters, evacuated about a dozen of the 37 Americans at the U.S. Embassy in Beirut to Cyprus Friday amid scattered fighting in east Beirut, a Pentagon official said. He referred questions about details and the reason for the evacuation to the State Department, which declined comment. The Lebanese army and Christian militiamen fought scattered skirmishes Friday, but a fragile cease-fire appeared to hold in most of east Beirut - where the U.S. Embassy is located - after three days of heavy fighting that left 57 people dead. The relative calm prompted a few residents to venture into the streets to buy food or check on relatives, but schools, banks and most businesses remained closed.