The Philippines has begun holding active school shooter drills after a rare act of violence in Tacloban City last month during which two teenage students opened fire, killing three schoolmates and injuring 20 others. On Wednesday, at one educational campus in Manila, hundreds of students and teachers practised barricading classrooms with desks and chairs and staying silent as an armed actor wearing a black hoodie scoured the halls and rooms. “We acknowledge the increasing number of violent...