Chicago police say four people in a car were killed in a head-on collision with a city bus.

Police spokeswoman Officer Michelle Tannehill said the accident occurred about 5:50 a.m. Sunday on the city’s west side. The car was speeding and hit a parked car, she said. The car’s driver then lost control and the vehicle collided with a Chicago Transit Authority bus.

Another police spokesman, Officer Michael Carroll, said later Sunday that all four people in the car died. He said the bus driver and four passengers were taken to hospitals with non-life threatening injuries.

The driver, 27-year-old Bernard “Bee” Chatman, and a 23-year-old female passenger were pronounced dead at Stroger Hospital. Two other female passengers, 22 and 25, and were also pronounced dead at Mount Sinai.

Police said that officers discovered alcohol in the vehicle Chatman was driving.

CTA spokeswoman Catherine Hosinski said the crash involved a No. 20 bus that was heading eastbound when the accident occurred.

Two of Chatman’s uncles told CBS Chicago that they do not know who else was in the car, but said friends were following him in another car.