The A146 outside of Norwich was closed by police following a collision between a bus and a pedestrian.
Norfolk police said on Twitter the road was shut at Framingham Pigot, at the junction with Trumpery Lane.
A Norfolk police spokesman confirmed a pedestrian was treated at the scene by the ambulance service after being involved in a collision with a bus.
The condition of the pedestrian is not known at this time.
Motorists were advised to find alternative routes.
The collision affected a number of bus routes in Norfolk, with First confirming on Twitter the X2, X21 and X22 services were diverted through Poringland.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here