Four people are being treated in hospital after a school bus overturned in Co Down.
The mother of one of the children on the double-decker told how pupils were left screaming in fear after the crash.
The Northern Ireland Ambulance Service (NIAS) said 43 people and a driver were in the vehicle when it crashed in near Newtownards.
Emergency services and a specialist rescue team attended the scene on the Ballyblack Road East at Carrowdore on Monday afternoon.
Images on social media showed the double-decker on its side in a field.
A spokesperson for the NIAS said: “Following a road traffic incident this afternoon in the Carrowdore area, the Northern Ireland Ambulance declared a major incident, based on the number of resources required to attend the incident.
“Initial reports indicated that approximately 70 people were on board the bus. This figure has been revised to 43 and a driver.
“NIAS has assessed and treated patients at the scene, with four currently requiring further treatment at hospital.
“The remainder have either been, or are in the process of being assessed, with a view to discharging at the scene.”
Dylan Lee (12), a year eight pupil at Strangford Integrated College, was with his mother Stacey Lee at the scene after the crash.
“I was on the top deck on the right hand side. I was just sitting with my friend: He is fine, he just hurt his arm,” Dylan said
“The bus hit a post and it started to stall and went down this hill.
“It just started shaking. I closed my eyes and then I opened them and I was on the floor.”
He added: “The first thing I did when I got up was to phone my mum.”
His mother said Dylan had a lump and a cut on his head, adding: “I could hear him screaming that he had crashed and I could hear all the kids in the background screaming. It was awful.”
Dylan added: “Then there was this guy came down with a hammer and the windows were all being smashed so we could get out.
“I was crawling under stuff like railings and school bags and stuff. It was on its side in the field.”
The PSNI described the incident as a “serious road traffic collision”.
The Northern Ireland Fire and Rescue Service said: “Five fire appliances and the specialist rescue team are currently at the scene of a road traffic collision involving an overturned bus.”
The South Eastern Health Trust said it was responding to the major incident: “Our staff in the emergency department are preparing to treat anyone who needs our care.
“We would ask any patient not requiring emergency care to please use alternative services. If your condition is life-threatening, please visit the Emergency Department at the Ulster Hospital as normal.”
Local SDLP representative Will Polland said concerns had been raised multiple times about the road where the crash occurred.
He told the BBC: “First responders were on the scene as quick as possible and we are incredibly grateful for that.
“Our hearts and prayers go out, not just to those who are unfortunately involved, but those who have responded.”
He added: “This road has had concerns about it raised multiple times.
“I send all my prayers out to everyone involved in the incident. It is an absolute tragedy.”
A Facebook post from First Ards Presbyterian Church said they were thinking of everyone involved.
The post continued: “Our hearts and our prayers go out to all the students, families and staff who are affected.
“For those in our youth ministries who go to the school, please know we’re especially holding you close in prayer right now.
“If anyone needs a chat, support, or just someone to listen, don’t hesitate to reach out. We’re here for you.”
