ARAPAHOE COUNTY, Colo. (KDVR) — The Arapahoe County Sheriff’s Office is investigating a major crash involving an RTD bus and multiple vehicles on Thursday morning.

The crash happened before 6:30 a.m. near Parker Road and Orchard Road.

The sheriff’s office said four people were taken to the hospital with serious injuries, including the driver of the RTD bus and a passenger.

The Colorado Department of Transportation said the northbound lanes of Parker Road reopened around 8:15 a.m. near Cherry Creek State Park.

This is a developing story. Please check back for updates.