Palestinian health officials said eight Palestinians were killed Tuesday in an Israeli raid on the West Bank city of Jenin, where an AFP correspondent reported masked gunmen exchanged fire with Israeli forces. Smoke billowed over the refugee camp adjacent to the city after a series of explosions inside, while at least five gunmen clashed with troops in a nearby downtown neighbourhood, the correspondent reported. The Palestinian health ministry in Ramallah said Israeli troops had killed eight people — raising an earlier toll of seven — and wounded nearly 20 others during the raid, which began…