JENIN, West Bank, June 19 (Reuters) - Israeli forces backed by the rare use of helicopter gunships killed five Palestinians including a teenager and wounded more than 90, as a West Bank raid led to an hours-long gunbattle with armed fighters, the military and health officials said. Eight Israeli personnel were wounded after troops came under fire during an operation in the flashpoint city of Jenin to arrest two Palestinians suspected in attacks, the military said. Earlier in the evening, the Israeli military said two assailants rammed their car into soldiers operating around a checkpoint in the northern West Bank