A U.S.-Vietnamese team searching for the remains of four American airmen near Hanoi has confirmed that it found a U.S. Air Force B-52 bomber that went down during the Vietnam War, a spokeswoman said in Bangkok, Thailand. Capt. Virginia Pridyla said the team found a “number of larger aircraft parts” and operator manuals. Vietnamese searchers said four airmen were killed when the B-52 was shot down on Dec. 20, 1972. The continuing excavation has also turned up nearly 20 unidentified bone fragments.