Philippines tightens security after blast in southern town

Members of the Philippine National Police's Special Weapons and Tactics (PNP-SWAT) participate in an anti-terrorism drill in Manila, the Philippines, April 4, 2019. Philippine security forces have tightened security after Wednesday's blast in southern Philippine Isulan town in Sultan Kudarat province that wounded 18 people at least, a military general said on Thursday. (Xinhua/Rouelle Umali)