The U.N. human rights office on Wednesday estimated that up to 1,400 people may have been killed in Bangladesh over six weeks last summer in a crackdown on student-led protests against the now-ousted former prime minister. In a new report, the Geneva-based office says security and intelligence services “systematically engaged” in rights violations that could amount to crimes against humanity and require further investigation. Citing “various credible sources,” the rights office says as many as 1,400 people may have been killed in the protests between July 1 and Aug. 15, and thousands more were injured, “the vast majority of whom were shot by Bangladesh’s security forces.”