Seven persons allegedly raped a 30-year-old woman after killing her five-year-old son in a village in Bihar's Buxar district. One person has been arrested in connection with the incident, while search is on to nab the others. On Saturday, the accused took the woman to a jungle when she had come to Chaigain village to deposit money at a bank along with her son, raped her and killed the child. The men then threw the woman and her son in a canal after tying them with a rope, according to the police complaint.