According to NBC affiliate WWBT in Richmond a male teenage suspect was being medically evaluated while a warrant was issued for his arrest.
The police said that Richmond Police officers were called at 6:30 p.m. after the reported attack in the backyard of the siblings' home, located near railroad tracks, adding that the brother and sister were playing together on the track when the suspect approached them and sexually assaulted the girl.
The report adds that the boy tried to help his sister, but the suspect struck him in the head with a brick, pointing out that he died at the scene.
The Richmond Police noted that the officers hunted for the suspect on Thursday night, but investigators said the victim was threatened by the assailant to give false information.
Neighbor Tracy Lightsey said the brother and sister were inseparable. The family told her that the boy was trying to fight off the man.