POLICE in Pursat province have arrested the mother and older sister of a 6-year-old girl who was raped, robbed and killed late last week, saying they tried to help the culprits cover up the act. So Sahong, deputy police chief in Pursat’s Phnom Kravanh district, where the crime occurred, said the two women were arrested on Monday and sent to the provincial police station. “We arrested the ... mother and sister because we suspected that they were involved in this case because they helped by hiding the girl’s clothes,” he said. The two men suspected of committing the crime, both cousins of the victim, were arrested in Batttambang province, apparently while trying to flee to Thailand.