The bus mounted a kerb, hit a group of primary school pupils, and crashed into metal fencing.
Four children are in stable condition in hospital after being hit by a school bus.
The bus crashed into a group of primary school children at about 15:25 BST on Monday in Llanfair Caereinion, Powys.
Three children were airlifted to hospital with another child and the male bus driver both taken by ambulance.
A fifth child was discharged at the scene. The bus had no passengers.
The bus mounted the kerb and crashed into metal fencing on School Lane, just off Neuadd Lane.
It has since been removed for forensic examination and the road has reopened.
A service will be held at Capel Moreia in Llanfair Caereinion later on Tuesday for “quiet reflection and prayers”.
Ysgol Uwchradd Caereinion High School and Llanfair Caereinion Primary School are on either side of Neuadd Lane.
Dyfed Powys Police have confirmed that school community police officers will be attending the pupils’ school on Tuesday to provide support.
Powys council said its school service officers were in the town “providing support to both the high school and primary school”.
