Moscow police have launched a manhunt for the people who attacked a LGBT-friendly venue in central Moscow overnight, police sources say.

"An inquiry has been launched into the nightclub attack, CCTV footage from the venue has been seized and that from nearby streets is being examined," the police source told RIA Novosti.

About 20 masked attackers burst into the 7freedays club, where people were celebrating “coming out day,” Andrei Obolensky, the event’s organizer, told RIA Novosti.

“They pulled a gun on the bouncers as they entered the club. Then they shouted ‘You wanted a show?’” Obolensky told RIA Novosti. “People were bleeding; they had been hit in the head with bottles.”

Two of the three people hospitalized for the injuries they sustained in the attack have now been released from hospital. One girl, who suffered a serious eye injury, is still being treated.

There were about 50 people in the club at the time of the attack, eyewitnesses told RIA Novosti.