A group of corona deniers and vaccination opponents broke into the building of the Slovenian state television RTVS late on Friday evening.
They asked the broadcaster to give their opinion on the matter.
The police immediately stopped the attack and arrested 20 intruders in the station's news studio.
as the Slovenian news agency STA reported on Saturday.
"This is an unacceptable attack on the media, journalism and democracy," said the station's news editor Manica Janezic Ambrozic.
The Slovenian journalists' association DNS said the incident was only “the tip of the iceberg” in the “hate campaign” that Prime Minister Janez Jansa's government was waging against the media.
Jansa condemned the incident.
He wrote on Twitter on Saturday: "This is violence against freedom." Everything must be done "to condemn and punish any kind of arbitrary and violent appropriation of public space (...) as well as threats".
The television director Andrej Grah Whatmough described the incident as a "bad attack on our media company" and announced heightened security measures.
The corona deniers have been protesting in front of the television building for four months and harassing its employees there.
The problem is that the area in front of the television building is public land, so the protesters are entitled to gather there, Whatmough said.
Behind the incident is a movement led by former army officer Ladislav Troha, a veteran of the 1991 Slovenian War of Independence, STA said.
In Slovenia, the incidence of new corona infections in the last 14 days was 257.3 per 100,000 inhabitants.
50.8 percent of Slovenes have full vaccination protection.