virginia state police, and especially the alexandria police for their work and helping us respond and mitigate this incident. we continue to provide a robust and visible presence at the capitol complex and to monitor national and world events to provide a level of security that's appropriate. >> reporter: can you describe officer griner's response? >> as part of the investigation and i won't comment. >> reporter: agents who were with congressman scalise, is it a protective detail? what is their mission? >> their assignment today was to protect the congressman. >> reporter: was he the only one who had protective detail? >> we had capitol police officers assigned to monitor the event. >> reporter: there is video and audio recordings of the gun battle. it would appear to have been