Three people have been taken to hospital and 13 children injured after a crash between a school bus and a car.
The crash occurred at around 8.30am on Monday near the village of Llandissilio in Pembrokeshire, Wales.
The school bus had been ferrying children to the Ysgol y Preseli secondary school, reports Wales Online.
Pembrokeshire Council confirmed that a number of school children sustained minor injuries.
Parents were being reassured none of the injuries were thought to be serious and were encouraged to pick up their kids from areas near the crash site.
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One parent who picked up her son from the scene said the school bus was packed with children at the time of the crash.
The child said the bus was involved in a "head-on collision" with a car but that none of the pupils on-board sustained serious injuries.
The turn off at Efailwen and the Angel Inn pub was closed in both directions following the collision.
A spokesman for the council said: "The A478 in Pembrokeshire has been closed this morning following a serious collision involving a school bus and another vehicle.
"The collision happened at around 8.30am as the bus was taking pupils to Ysgol y Preseli. Emergency services are at the scene and the road remains closed whilst the emergency services deal with the incident.
"Thirteen young people are understood to have received injuries. None of the injuries to these young people are understood to be serious.
"Parents and guardians of the young people travelling on the bus have been contacted to collect their children."
One school bus was involved in the crash and two other buses were caught behind the crash within the road block.
Some children are understood to have been taken to the nearby Llandissilio Holiday Park while emergency services remain in attendance.
The Welsh Ambulance Service confirmed that three people had been taken to two different hospitals in west Wales as a result of the crash.
A spokesperson for Dyfed-Powys Police said: "We are at the scene of a serious collision on the A478 near Llandissilio in Pembrokeshire. The incident was reported to police at 8.35am, and the ambulance and fire services are also in attendance.
"The collision involved a motorcar and a bus carrying school children. A number of children received minor injuries with two taken to hospital by ambulance with what are described as minor injuries. The road is currently closed and officers remain at the scene.”
A telephone number - 01437 775400 - has been set up for concerned parents and guardians.
