Denver police officials said the officer, who has not been identified, was taken to the hospital with serious injuries and the driver stayed on scene. The crash was not intentional.

Thousands of unionized King Soopers employees are on strike all across the Denver metro area. Union organizers held a press conference Thursday morning, calling attention to their concerns.

On Thursday, over 10,000 King Soopers employees went on strike across the Denver metro and Front Range, with several workers in Colorado picketing outside the large grocery store chain.