Two Indianapolis children were involved in a mini-bike accident Tuesday that sent them both to Riley Hospital. It happened a little after 8 p.m. in the 8200 block of Paddock Road. According to police, an 11-year-old boy and 9-year-old boy were traveling northbound on a mini bike when they left the road and hit a tree. The 11-year-old was driving. The 9-year-old is in critical condition with severe head injuries. The 11-year-old is in fair condition with only minor injuries. Neither child was wearing a helmet.