A man has been arrested for suspected drink or drug-driving after a school minibus overturned outside a primary school.
One of the 12 pupils on board was taken to hospital with an arm injury.
It happened at Cross Ash Primary School near Abergavenny, Monmouthshire at 0851 BST.
A man, 59, was arrested for suspected driving while unfit through drink or drugs and driving without due care and attention.
He remains in police custody as officers continue their inquiries.
Groesonen Road was temporarily closed while emergency services attended and the vehicle was recovered. The road has now been re-opened.
Three fire engines attended but only one was needed.
All the families of the children on-board have been notified.
A spokesman for Monmouthshire council said the authority had launched a full investigation into the incident and whether any lessons could be learned.
"We are very concerned that a bus service contracted by Monmouthshire County Council to take children to Cross Ash Primary School was involved in an accident this morning," he said.
"We're relieved that there were no serious injuries and our first thoughts are with the children and their families as they recover from this incident."