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
Sunday has the best of the weather this weekend, looking fine and sunny with high temperatures. Some showers around on Saturday.
Police have this afternoon confirmed they have arrested two people in connection with a shooting in Somerset last night
More than 2,000 young people are gathering on Dartmoor today ready to take part in the Ten Tors challenge.