The car crash at Interstate 35 and Illinois that knotted traffic Tuesday morning was caused by drivers who were racing. Police think alcohol might have been a factor as well.

Two people died in the seven-car pile-up and three others were taken to the hospital. Police arrested two 39-year-old men, Kory Lamonte Crayton and Frederick Don Sibley, according to the Scoop Blog. They could be charged with criminal negligent homicide. Both men also were injured in the crash, which happened around 5 a.m. Tuesday.

CBS DFW quoted a bystander saying this: “What’s it look like when a crash dummy hits a car? That’s exactly what happened.”

Traffic was backed up for hours on I-35, and it looks like a DART driver is in trouble for driving illegally to get out of the gridlock, according to KVUE.

“That operator should not have done that, period,” DART spokesman Mark Ball told the TV station. “And because he did, he will be counseled.”

No passengers were on the bus at the time, and the driver is being suspended for three days.