The Iowa State Patrol is investigating whether a driver was intoxicated when his vehicle crashed into a West Des Moines police patrol car and seriously injured an officer early Sunday.

West Des Moines Police Officer Jon Kaufman was waiting for a tow truck as part of a traffic stop near Westown Parkway on Interstate 35 just after midnight Sunday when another vehicle driven by John Schwartz, 61, of Kellogg, crashed into his patrol car, West Des Moines Police Sgt. Jason Bryan said in a news release.

Kaufman and Schwartz both suffered serious injuries and were hospitalized, officials said. Investigators did not provide an update to their conditions Monday, the Des Moines Register reports.