From Der Spiegel:
Unstrittig ist, dass in den Hinterhöfen des MfS und der Volkspolizei gepanzerte Wagen mit Schusswaffen bereitstehen; dass am Hauptbahnhof sechs LkW mit Räumgittern postiert werden, ...
The word Räumgitter cannot be found in any of the dictionaries Reverso, dict.cc, or Duden. The similar word suggested, Raumgitter, refers to some chemical structure and is thus unrelated. From my Google search, "Räumgitter" is some vehicle related to military, but I can't find a good reference. What does the word mean?