Three schoolchildren were seriously injured when a double-decker bus crashed into a bridge in Winchester.
The collision caused “significant damage” to the top of the bus in the crash in Wellhouse Lane shortly after 8am on Thursday.
"Three students with serious, but not life-threatening injuries, have been taken to hospital," Hampshire Police said in a statement.
"A further 13 students with minor injuries have been dealt with at the scene."
Winchester school bus crash
All the students involved are aged between 11 and 16, police said.
The bus was carrying secondary school students to the Henry Beaufort School in Harestock.
Robert, a 15-year-old student, said he was uninjured but “shaken” after the incident.
The pupil, who did not want to disclose his surname, said: "I was on the lower deck. I was on my phone when it actually happened, we went under the tunnel and I heard a crash, and I didn’t think it was as major as it was, I didn’t know what tunnel we were under.
"It took a little while to realise what was happening…part of the roof fell down to the side of the bus that I was on.
"I waited for the people on the top deck to get off, and at that point I saw some of the bad injuries people had. I think everyone was in shock.
"When we got off the bus, everyone sat down on the grassy bank outside, people started to panic and phone parents, some people started to cry.
"It took like an hour maybe while everyone was sorted until we started to leave."
Police said a road closure is in place on Wellhouse Lane from the junction with Andover Road North to School Lane.
"We are working in cooperation with the school and Hampshire County Council children’s services to provide support to the students and their parents," police said.
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South Central Ambulance Service, Hampshire Fire and Rescue and Network Rail were called to the scene.
Stagecoach said it is carrying out an internal investigation as it confirmed that one of its buses collided with a bridge in Hampshire on Thursday morning.
A spokeswoman for Stagecoach South said in a statement: "We can confirm that one of our bus services was involved in an incident in north Winchester at around 8am this morning.
“The bus was carrying children to the Henry Beaufort secondary school in Winchester as part of our contract with Hampshire County Council.
"Our thoughts are with the children and their families.
"We are carrying out an internal investigation into the circumstances involved in the incident and we will continue to provide the emergency services with our full support."
This story is being updated.