A major incident has been declared after a school bus and a car were involved in a crash in Drumquin, Co Tyrone.
More than 50 people, mostly children, have been injured after the collision on Omagh Road, but Sky News understands none of them are seriously injured.
The bus and the car ended up on their sides in a field.
Northern Ireland Ambulance Service spokesman John McPoland said: "Fifty-two people were treated at the scene but none of their injuries were serious. The vast majority were checked as a precaution because of their age.
"Six people have slightly more than minor injuries. This would include children who banged their heads off the bus windows but no one went through any windows."
A total of 48 people have been taken to the South West Acute Hospital and Altnagelvin Hospital.
Omagh Road has been closed between Segully Road and Drumrawan Road.
The bus was travelling from Castlederg to a secondary school in Omagh.
The crash happened in Deputy First Minister Martin McGuinness' Stormont constituency.
He has tweeted: "Relieved to hear there are no serious injuries to pupils & adults in this morning's bus & car accident on Drumquin-Omagh Rd #bestwishestoall."
Sinn Fein councillor Frankie Donnelly, who represents West Tyrone, said the crash "had the potential to be a major disaster".
He said: "This is obviously a traumatic incident for everyone involved, including the parents, so I would like to thank the emergency services for their swift response to the accident that ensured everyone was treated quickly and professionally."