The activist group, LGBT Russia, described the incident on their facebook page:
At 12:00 LGBT activists approached the Duma to hold a “Propaganda of love” protest act involving couples kissing in front of the Duma building (homosexual as well as heterosexual ones). In several minutes the Orthodox activists started to throw eggs at the LGBT activists, some of aggressive men attacked the couples. The police arrested 18 people around 12:30 p.m. Among them were 11 participants, 5 Orthodox activists and 2 journalists.