Four people remain in hospitals after Friday’s hotel shuttle accident in College Park, police said.

Two passengers are in Grady Memorial Hospital and two more at the Atlanta Medical Center. All are in good condition, College Park police Sgt. Keith Stanley told The Atlanta Journal-Constitution on Tuesday morning.

A shuttle bus carrying 15 passengers late Friday morning slammed into the rear of a tractor-trailer that was making a U-turn on Loop Road just south of Virginia Avenue.

The truck driver was not injured, but the bus driver and all the shuttle’s passengers were taken to area hospitals.

Police, with the help of the Georgia State Patrol’s special collision reconstruction team, continue to investigate the crash.

Stanley said the investigation could take up to two weeks “before anybody might be charged.”