Thirteen people are injured after a crash that left an RTD bus flipped onto its side over a busy stretch of road Monday morning.

The bus was headed west on Arapahoe Road when it swerved in an attempt to avoid a vehicle that made what the Boulder County Sheriff's Office is calling an incorrect turn.

The vehicle ended up going down an embankment and riding along a concrete wall before tipping over on the north side of the road.

On Monday, the sheriff's office said shortly after the wreck that a couple of the people injured were taken to the hospital, but that none of the injuries were serious.

The crash prompted investigators to close Arapahoe between 63rd to 75th streets, but the road has since reopened.

It's unclear how many people were on the bus at the time of the crash.