Police say four young men were killed in a shootout after a chase in a stolen car in September . After receiving gruesome photographs , families suspect the young men were tortured . The bodies of two other victims have been found and are being held by police for further investigation. Sao Paulo public defender has asked U.N. to investigate the killings .
Police say four young men were killed in a shootout after a chase in a stolen car in September . After receiving gruesome photographs , families suspect the young men were tortured . State officials have declined interview requests but say they are investigating the deaths . Sao Paulo public defender has asked U.N. to investigate the killings .