Check out the footage of it all from near field level, it's jaw-dropping.
UEFA officials say the stunt "caused injuries to several people attending the game who are now in hospital."
They added the whole thing was "reckless and dangerous" and insisted law enforcement would get involved.
German team spokesperson Jens Grittner also added, "The incident is being checked by the police, the authorities here in Munich and at UEFA. But, of course, we also condemn what happened there. It could probably have turned out much worse.''