The U.S. Park Police are searching for a passerby who is being commended for performing CPR on a female bicyclist in Rock Creek Park this morning. Park Police said the bicyclist suffered a “cardiac event.”

A passerby saw the victim, notified EMS and began CPR. The woman is now in critical condition at an area hospital but breathing on her own.

Park Police would like to speak to the person who performed CPR, or any other witnesses, to learn more about what happened.

Anyone with information should call Park Police at 202-610-8737.