World IN BRIEF : PANAMA : Terrorists Say They Targeted Americans

A terrorist group has claimed responsibility for the fatal crash of two U.S. helicopters and the grenade attack on a discotheque, and it threatened more attacks on Americans and U.S. property. The group calls itself the Dec. 20 Movement, or M-20, and is the first terrorist group to surface following the Dec. 20 U.S. invasion that overthrew dictator Gen. Manuel A. Noriega. One U.S. soldier died in the March 2 grenade attack, and 11 died in the Feb. 21 air crashes. The U.S. Southern Command had no comment on the report. But it had blamed the helicopter crashes on bad weather.