The body of the minor had visible cut wounds on the back and head, and was transferred to Longisa sub-County hospital mortuary in Bomet County awaiting autopsy.
Police said the bus from Mesabisabi Secondary School was heading from Narok to Bomet while the Narok Line Services matatu was driving in the opposite direction.
The accused, Musa Ole Sopia, also known as Ololunga, is suspected of being involved in several killings in the Ololulunga area of Narok South Constituency.
The incident happened at Ololulunga junction in Narok County.
Police say the driver of the Bomet-bound matatu lost control after its rear right tyre burst.The matatu rolled 20 metres off the road in the 7 p.m. accident.
Locals in Naaisuya and Olorroito told Citizen Digital that the bridge was swept as heavy rains pounded the region.The temporary bridge links the two areas to Narok town.
The area assistant police commander Felix Kisalu said among the injured was a person living with a disability.
The body was taken to Longisa Hospital mortuary.
