Twenty-one fires ignited by incendiary balloons were dispatched from the Gaza Strip Tuesday afternoon, two hours before Israel’s annual Jerusalem flag parade started in the Old City. Dozens of Palestinians rioted on the southern Gaza-Israel border. The Iron Dome deployment against Palestinian rockets was beefed up. The parade organizers changed the route to skip the Muslim Quarter and avoid a shutdown of shops for securing the event. Security forces are on the alert for disturbances in Jerusalem, in Judea and Samaria and Israeli Arab locations.