Four people are being treated in hospital after a school bus overturned in Northern Ireland.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 on the vehicle when it crashed in Co Down.

Four people are being treated in hospital after a school bus overturned in Northern Ireland.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 on the vehicle when it crashed in Co Down.