LH 4578 occupied by Iranians in Brussels?

[Kerosene Kraut]

German TV ZDF Text (http://www.zdftext.de/) reports a LH a/c has been occupied on the ground in Brussels today by iranian protesters. Pax and crew left unhurt. a/c is said now to be "not airworthy" anymore. Does anybody know what exactly happened?

[leonbrumsack]

According to the link on ZDF Text, before leaving the aircraft, the crew took some sort of actions to render it 'unairworthy'.