The Detroit Police Department says one of its motorcycle officers was critically hurt when a U.S. Postal Service truck hit her.
The accident happened Monday afternoon in downtown Detroit.
Police spokeswoman Sgt. Eren Stephens tells The Detroit News the motorbike and truck collided head-on, and investigators are trying to find out how it happened.
WDIV-TV says a witness called 911 but was placed on hold, so instead used the injured officer's radio to call for help, which then arrived quickly.