St. Louis Police Chief John Hayden told reporters Monday night that the crash occurred about 6:30 p.m. when the pair of officers were on a westbound stretch of the highway near Boyle Avenue talking to a person whose car had stalled. Another fast-moving vehicle came through the area where the officers were standing, striking them both, Hayden said.

Police haven’t released the names of the officers or their conditions. But Hayden said he spoke with the officers, both men, in the hospital and they will require X-rays to determine the extent of their internal injuries.

“Both of them are talking and responsive,” Hayden said. “However, both of them were obviously in serious pain.”

Police have not released the identity of the driver of the vehicle that struck the officers. Hayden said that currently no charges have been brought against the driver who remained at the scene, and there is an investigation underway.

“Obviously, they were going too fast in that zone,” he added.

The officers were outside their marked police SUV and were assisting a stalled GMC Acadia, reports KMOV. A Lexus ES 350, driven by a 21-year-old, struck the police SUV that had its emergency lights on. The Lexus slid into the median and crashed into the Acadia and the two officers. Five occupants of the Acadia were also taken to the hospital in critical condition.

“For us, we’re cognizant of that every day; for the general public, they maybe don’t think about it so much until it happens,” Jeff Roorda with the St. Louis Police Officers Association, told the station. “These officers … they all hate being out on the highway. I was a cop. You just hate being out on the highway with these cars buzzing by at high speeds.”

One of the officers was a probationary officer and the other had been with the department six years, the St. Louis Post-Dispatch reports.

Missouri’s “move over law” requires drivers to change lanes, when it’s safe, or slow down when approaching law enforcement or other official vehicles displaying their lights on the side of the road.

Newsweek has reached out to St. Louis police for updates.