I was at my desk working on a project on a computer when I suddenly heard a loud bang. It sounded like a gun shot. Suddenly there was a warning about and intruder inside the building. I saw a couple of my co-workers trying to go outside so I followed.
While we were trying to go outside we bumped into the intruder. He was pulling out the gun but I grab his hand and made him fire the bullet at the roof. Then another co-worker got behind him and hit him in the head.
After me and my co-worker knocked him out the others came and started tying the intruder up. A little bit later we heard the police cars outside and the police came and arrested the intruder.