At least 30 people were reportedly killed and 53 wounded in an explosion in a UN-run school in the town of Jabalya in the northern Gaza Strip, according to Palestinians. The IDF issued a statement saying the school grounds were used by terrorists to fire mortar shells at the troops. According to the IDF, among the dead were members of a Hamas launching cell, including operatives Immad Abu Askar and Hassan Abu Askar. Slideshow: Troops inside Gaza The infantrymen returned mortar shell fire into the school grounds, the army said. Defense officials told The Associated Press that booby-trapped bombs in...