Brazil is having another issue with a Taurus firearm. This time it is a Taurus CT40. The CT40 is a pistol caliber carbine. This video was posted by Forças Policiais do Brasil.
The shooter demonstrates this malfunction by loading a magazine. While keeping his right hand away from the trigger, he pulls the charging handle and lets it go. The gun immediately starts shooting in full auto without any pull of the trigger.
edit: A reader commented and noticed that it looks like the trigger is somehow kept in the rearward position. In that case the trigger has been pulled but is not resetting forward.