By MITRA TAJ Six people were killed and at least 20 were injured by an earthquake that hit the central highland region of Peru, authorities said Sunday. The quake struck in the Junín region, near the rural district of Chongos Bajos, at 9:24 p.m. Saturday, damaging or destroying dozens of houses and forcing about 300 people to take refuge in a sports stadium because of aftershocks, according to Peru’s National Institute of Civil Defense. The quake also damaged the town’s 16th-century church…