Cincinnati bus crash - A Greyhound bus overturned on an interstate in southwest Ohio early Saturday, leaving at least 34 people injured, four in critical condition, and 12 in serious condition, ABC News reported Sept. 14.

According to a statement released by the Officials with the Butler County Emergency Operation Center, the bus, which was carrying 52 people and was heading northbound on I-75, accidentally overturned about 26 miles north of Cincinnati at around 4 a.m.

WHIO Dayton reported that the Greyhound bus was heading to Detroit and other stops in Michigan, but suddenly overturned in a cornfield off the right side of the freeway more than a hundred yards from the road.

Authorities said 34 injured people have been transported to area hospitals, six of the 34 were taken by medical helicopters while the remaining 28 were taken by ambulance to nearby hospitals, USA Today reported.

As of late, four of the injured are still in critical condition while 12 are in serious condition, ABC News reported.Greyhound has dispatched an additional bus to transport the remaining uninjured passengers.

"We're still putting together pieces of the puzzle," said Highway Patrol Lt. Edward Mejia. "We haven't determined the cause."

William Brown, a passenger of the overturned Greyhound bus, said he was asleep inside the bus when the incident happened, adding that he was headed to Detroit to see 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 to WHIO. 

"I'm just glad that a lot of people are still alive and okay.""The bus started shaking...and we hit a tree then after we hit the tree we rolled... at least twice," another passenger, Christopher Lake, said.

Meanwhile, Mejia said that the driver, Dwayne Garrett of Cincinnati, was also injured from the Cincinnati bus crash after he got trapped inside the overturned bus, adding that the driver already gave a statement to investigators and has even voluntarily allowed his blood to be drawn for testing.

However, results will only be available at least a week after, CS Monitor reported Monday.

A passenger claimed that Garrett may have been experiencing a medical problem, but Mejia said the driver was "conscious and alert" at the scene. 

Greyhound Lines Inc. spokeswoman Alexandra Pedrini said Garrett was well-rested and has 15 years of driving experience "with a clean record."