The directors of a conference hall who cancelled a press conference by a gay organisation for "security reasons" should resign.
Marko Karadžić, minister for human rights in the Serbian government, said the behaviour of the Sava Centre was unacceptable.
The Gay-Straight Alliance (GSA) news conference was due to take place at the New Belgrade premises.
The cancellation caused a protest of Alliance activists.
"What surprised me is that is that such discriminatory opinions, which made the news conference impossible, were explained in that way—that means neither the place, nor the hall were a problem, but only the organiser and the theme which was to be discussed at the press conference," said Mr Karadžić.