Buying at gunpoint

There have been reports recently of military or armed police buying at gun-point all copies of a newspaper that for some reason they don't wish to see the light of day. While one reaction to that might be to print more copies and continue selling them to the police, this may not always be possible and the practice does result in the public not getting the news. It's an unusual form of censorship and there is some US case law on it - surprisingly recent in fact - but I wonder if this issue has been litigated in other countries.