WATCH: 3 Arrested In Brutal Attack on Gay Activist In Belgrade

Three men have been arrested in Serbia in connection with the weekend assault of a German activist who was attending a gay rights conference in Belgrade last week, which left the activist with life-threatening injuries, reports Towleroad.

Towleroad posted security video of the Saturday evening ambush in the Serbian capital, noting that it is currently unclear if the attack was motivated by homophobia.

However, according to U.K. LGBT outlet Pink News, witnesses say that one of attackers shouted the word "foreigners" as he struck the unnamed activist.

The 27-year-old activist is in serious condition after suffering internal bleeding, head injuries, and undergoing surgery, PinkNews reports. Both the hospital where the victim is being treated and the German Embassy declined to release the name of the victim.

German Ambassador to Serbia Heinz Georg Wilhelm told PinkNews that the victim, a German citizen, "[I]s awake, so that is already very good, but it is still early to say something."

The German ambassador did express concern about the intolerance the attack may represent.

"If it's true that the attacker said that he does not want foreigners in Serbia, that gives a new xenophobic dimension to the whole incident," Wilhelm told PinkNews.

Serbia has generally been a hostile place for LGBT people in recent years. Belgrade Pride has been canceled by authorities every year since 2010 due to security concerns. Serbian officials claimed that this year's Pride celebration was officially canceled because of massive floods in the region, according to PinkNews.

Watch closed-circuit security video that captured part of the attack below, presented with a trigger warning for graphic violence: