KABUL, October 26, SPA --Two helicopters collided Monday in southern Afghanistan, killing four American troops and injuring two, the military said. A third U.S. helicopter crashed in a separate incident in the west, leaving «some dead,» U.S. military spokeswoman Elizabeth Mathias said. She did not have details on how many or their nationalities, according to a report of The Associated Press. --SPA --SPA 14:45 LOCAL TIME 11:45 GMT www.spa.gov.sa/712772