At least 15 Palestinians have been killed and scores injured in a blast during a parade by the militant Hamas group in the Gaza Strip. A truck carrying gunmen and home-made weapons blew up during the rally in the Jabaliya refugee camp in northern Gaza. Israel has denied involvement, while the ruling Palestinian Fatah faction said it held Hamas responsible. It is the deadliest incident in Gaza since Israel pulled its troops and settlers out earlier this month. Hours earlier, Palestinians fired rockets into Israel from Gaza after Israel killed three militants in a raid in the West Bank town...