Israeli tanks crossed into the northern Gaza Strip in an operation to rout out rocket launchers Saturday, and Palestinian officials said a 17-year-old was wounded in an exchange of fire. The army said tanks crossed more than 250 yards into northern Gaza and responded with gunfire after they were shot at, including with RPGs. The militant group Islamic Jihad said it fired two RPGs at the troops. The soldiers detained nine Palestinians for questioning, the army said. Full Story