situation becoming violent, something drastically wrong or out of control
I was walking through the station on my way to work when I heared huge explosion, and then all the hell broke loose.
All hell broke loose when Mary found out that, she was going to be terminated from her job.
Everything was fire in the stadium until someone yelled “fire !” and then all hell broke loose as people started running and screaming and pushing each other.
John pushed the police officer, who was questioning him and all hell broke loose.
All hell broke loose after a young girl pulled out a gun, in the departmental store.