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
Gavin Henson booted an 18-point haul as Bath moved up to second in the Premiership with a 33-23 win over struggling London Irish.
The UK's first "number two" bus is to hit the road powered entirely by human and food waste.
The number of people seeking help with mental health issues after they leave the armed forces is rising here in the West Country.