KALAMAZOO, MI -- Police have released a video of a Pontiac car crashing into a bus in Kalamazoo.

The crash happened about 7:30 p.m. Wednesday, May 24, when a mid-sized Pontiac traveling at a high rate of speed struck a Metro Transit bus that was sitting at the light at the intersection of Oakland Drive and South Street in Kalamazoo, Detective Shannon Bagley said.

The car went airborne during the crash, he said. It was captured on the dash camera video of a police cruiser near the intersection.

Six people were injured and both drivers were initially trapped in their vehicles. Both drivers were in surgery following the crash, police said Wednesday evening.

The drivers of both vehicles are listed in serious condition, police said Thursday at noon.

Serious bus-car crash in Kalamazoo 5 Gallery: Serious bus-car crash in Kalamazoo

The bus was transporting six people at the time of the crash and four of them suffered injuries considered not life-threatening, police said.

The investigation is still ongoing and speed is still one of the factors in this incident. Detectives plan to release more information as the investigation continues.

Investigators want to speak with the car's driver, who was in critical condition following the crash.

Police don't know why the car was speeding or whether alcohol is a factor, Bagley said. Investigators said Thursday morning they were waiting for results of bloodwork.

"Until we talk to the people involved we're at a standstill," Bagley said. "Until we can speak to the driver of the vehicle, and that's not going to be any time soon based on his condition."

Metro Transit Executive Director Sean McBride said the bus was coming from downtown on its route.

The bus driver is a longtime employee of about 20 years of Metro Transit, he said.

Officials are working to obtain video from cameras inside the bus, he said, though the camera system may have been damaged.

Metro Transit will carry out its own investigation of the crash, he said.

Anyone with information about the crash can call police at 269-337-8994 or Silent Observer at 269-343-2100.