One person was seriously injured and 14 sustained minor injuries when the roof was ripped off a school bus last week.
Essex police were called to reports of a collision between the bus and a car in Clatterbury Lane, Clavering at around 8.15am on Thursday, September 21.
The bus, operated by Stephensons, was transporting pupils to Joyce Frankland Academy and Saffron Walden County High School.
Nine ambulance service vehicles and the Essex and Herts Air Ambulance attended the scene.
Two children were taken to Addenbrooke's Hospital in Cambridge, while others were taken to hospital by their parents later to have minor injuries examined.
Police have since confirmed the extent of the injuries. An Essex police spokesperson said: "Our investigation into a collision in Clatterbury Lane on Thursday, September 21 is in its early stages and our enquiries are ongoing.
"As of this morning, Friday, September 22, one passenger of the bus has sustained serious injuries, and 14 have sustained minor injuries."
The road was closed while firefighters worked alongside police and ambulance services to make the area safe.
Joyce Frankland Academy confirmed that the bus roof was damaged after it struck a tree branch.
Headteacher Duncan Roberts went to visit pupils in the hospital the day of the crash, and said: "We are all shocked that such a traumatic incident has taken place on one of the shared school bus routes this morning.
"We are, however, thankful that while some pupils have sustained some injuries, none appear at this stage to be serious, life changing or life-threatening. A small number of students have been to hospital to be assessed and treated.
"We thank the emergency services, who we have worked very closely with to manage the situation, staff, pupils, and parents for their quick and calm response to the incident as well as the wider community who have offered us their support.
"Colleagues from the academy were able to be at the site quickly with a minibus to take pupils to school if they felt well enough, where extra support was provided to the pupils involved and all parents were contacted."
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