A young woman had her head chopped off for refusing to prostitute herself - and one of the killers was her mother-in-law, police say. The other was the mother-in-law's cousin. And both admit it, according to Afghan police. To most people, the slaying of 20-year-old Mah Gul is unimaginable. But it's just "one more incident that highlights the violent atmosphere that women and girls face in Afghanistan and the region," Suzanne Nossel, executive director of Amnesty International USA, said Thursday. The killing happened Sunday in Herat province, in southwest Afghanistan along the Iranian border. Gul's husband is a baker. When he left home for work, his mother and her cousin tried to force the young wife into prostitution, said Noorthan Mikvad, spokesman for Herat police. When she wouldn't do it, they beheaded her, he said. In a statement, Nossel said women and girls in the region "are raped, killed, forced into marriage in childhood, preven