HAMILTON, Ohio (WHIO) -- More than 30 people were sent to the hospital after a Greyhound bus carrying 51 passengers overturned off of Interstate 75.
Emergency crews transported 28 victims to local hospitals by ground transport and helicopter medics took five patients to local trauma hospitals. Injuries from the crash range from severe to moderate, officials at the scene said.
Four of the trauma victims were brought to Miami Valley Hospital by CareFlight.
The bus was carrying 51 passengers and the driver when it crashed at approximately 3:58 a.m., the Butler County Sheriff's Department said. The cause of the crash is under investigation at this time.
Word that the driver had fallen asleep had been circulating among passengers who remained at the scene of the crash. These reports are all speculation at this time, said Lt. Edward Mejia of the State Highway Patrol.
Officials have deemed the crash a mass casualty incident because of the large number of victims involved in the crash.
CareFlight and AirCare helicopter units landed on the shut-down lanes of the freeway to transport injured passengers. Triage care was given to some victims at the scene as medics determine if any more transports are needed, said Jeff Galloway of the Butler County Emergency Management team of the Sheriff's Office.
It is too early to report if there are any fatalities in the crash, officials said.
The Greyhound bus, which was headed to Detroit from Cincinnati remains on its side in a cornfield several hundred yards from the right side of the freeway.
William Brown was asleep inside of the bus when it overturned. He was headed to Detroit to visit his family.
"I never thought that I would be part of an incident that occurred, especially today, just trying to get home to see my family," Brown said. "I'm just glad that a lot of people are still alive and okay."
At least one northbound lane of the interstate remains closed as OSP investigates the crash scene, located north of the Ohio 129 exit. The left lane of the northbound side has recently been opened.
Another Greyhound bus has been dispatched to take uninjured passengers back to Cincinnati.
OSP is in charge of the crash investigation and is taking measurements to reconstruct the crash.