Several dozen Romanian activists halted a show organized by a group defending the rights of homosexuals, triggering a sharp rebuke from the anti-discrimination body Thursday.
Brandishing Romanian flags, the anti-gay protesters booed and sang the national anthem and religious songs as the movie "The Kids Are All Right", telling the story of two moms living together, was about to start, witnesses said.
The policemen present in the hall did not intervene, so the screening was stopped, Irina Nita, head of the Accept rights group, told Mediafax news agency.
"We publicly condemn the homophobic incidents that took place Wednesday at the Romanian Peasant's Museum during the LGBT (Lesbian, Gay, Bisexual, Transgender) Month," the anti-discrimination council said.
Preventing such an event taking place "is a glaring violation of human rights and tarnishes Romania's image abroad," it added.
In November, several people were attacked in Bucharest by hooded young men after attending a show about gays.
Discrimination against homosexuals is still widespread in Romania where homosexuality was only decriminalised in the early 2000s.
An opinion poll conducted in 2011 shows that 73 percent of Romanians would not like to have a homosexual among their relatives and 45 percent among their work colleagues.