https://news.google.com/newspapers?nid=gL9scSG3K_gC&dat=19701124&printsec=frontpage&hl=en "U.S. POW Rescue Attempt During Bombing Bared]— N. Viet Camp Found Empty By Americans", Pittsburgh Post-Gazette, November 24, 1970, p1 When U.S. helicopters arrived at the camp, located 23 miles west of Hanoi, the rescuers discovered that the prisoners had already been moved to a handful of central prison complexes before the raid.