Story highlights Police racing to scene are told there is gunfire and people running

"We have a total of five down," an officer says

(CNN) As a gunman exchanged fire with Capitol Police officers defending a congressman and others at a Virginia baseball field Wednesday morning, local police swiftly set up a perimeter and called for more units.

Through dispatch audio posted to the archive section of the Broadcastify website, the timeline of the police and ambulance response unfolds.

The first dispatcher heard is sending units to a weapons violation call, someone with a gun. The man then calls fire units, saying, "Fire response is authorized. Multiple calls."

Just a minute later, the dispatcher describes the scene to officers: "Shots being fired and there are people running, possibly victims involved."

"It's coming from the baseball field," an officer says.

Read More