Disturbing video of officers laughing and fist bumping outside of Robb School about 1:30 PM Tuesday, May 24th. 2022

This disturbing video was taken between 1;15 Pm and 1:30 PM on the day of the Robb School massacre where 21 people and the gunman lay dead. A group of officers were witnessed fist bumping and laughing near the police perimeter. It is unclear if these officers were aware of what the incident was all about. Did they know an armed gunman had entered the school and killed 19 children and 2 teachers?  The attitude and emotions  displayed by the officers in the video raises many questions. Were these officers aware of the gravity of the situation?