Thirty-seven people were injured when a grenade lobbed at an army outpost instead exploded at a circus show in a southern Philippine city, police said Sunday. The show late Saturday was staged at a covered courtyard adjacent to the army base in the village of Fatima in Davao City, 990 kilometres south of Manila. The grenade "ricocheted when it hit a net barrier of the army outpost and instead exploded at the audience of the circus show, “city police chief Senior Superintendent Ronald Dela Rosa was quoted as saying by dpa.