Two Kansas City, Missouri, police officers who opened fire on a vehicle after responding to a report of gunshots are immune in a civil rights lawsuit, a federal appeals court ruled Monday.

A unanimous three-judge panel of the U.S. Court of Appeals for the Eighth Circuit overturned a trial judge who said the officers could be held liable for the shooting that night in November 2010 on the side of a road near I-435.

The police, who fired eight times, striking the van but not the driver, never found a shooter. In fact, there wasn't one. So what happened?