Dorset Police said three passengers and the driver of a double-decker bus have been treated for "minor injuries"
The bus, registered to Plymouth, was heading to Kingston Maurward College in Dorchester, police said.
Police, ambulance and fire crews were called to the A350 this morning after reports that a school bus had overturned in a field.
Three people and the driver were treated for minor injuries, and all those on board were moved to safety while they wait for replacement transport.
More top news
15-year-old Charlotte was killed on a beach in India in 2008. Two men are on trial but her mother says she's unsure justice will be done.
Visitors hoping to see the Man Engine tomorrow in Truro are being warned to get there early amid concerns of travel problems in the city.
Savannah Nicholls has cerebral palsy and severe epilepsy after complications from a bone marrow transplant.