A 17-year-old opened fire at a public high school in southern Thailand on Wednesday and briefly held people hostage during a two-hour attack that left at least three people injured, police and local officials said. The shooting occurred at Patongprathankiriwat School in Songkhla province shortly after classes were dismissed in the late afternoon, according to a statement from the provincial government. Authorities said police exchanged gunfire with the suspect, wounding him before taking him