Journalists were among the people arrested during anti-war protests in Russia on Sunday, Russian journalist Andrey Okun told CNN.

Russian journalists Anastasia Romanova from MR7, Angelina Trofimenko from Avtozak Live, Anastasia Rogacheva from SOTA, Andrey Okun from Zaksru and Elena Lukyanova from Novaya Gazeta were detained during the anti-war protests in St. Petersburg.

“I haven't been able to work for even a minute today. As soon as I took out the phone, the riot police approached me and forcibly escorted me to the paddy wagon. The reason for the detention was not announced,” journalist Andrey Okun, who has since been released, told CNN.

All of the detained journalists were wearing yellow “Press” vests, had accredited press cards and editorial assignments, Okun told CNN.

“My colleagues and I filed a collective complaint against the police actions and the illegal detentions of journalists, that are becoming larger with each protest action,” Okun said.

Russia’s riot police arrested more than 776 people in 37 Russian cities on Sunday, almost half detained in Moscow, according to OVD-Info, an independent human rights protest-monitoring group. According to the group, more than 5,000 people were arrested across Russia for participating in the anti-war protests last weekend and more than 14,763 protesters have been detained in 151 Russian cities since the start of Russia’s invasion on Feb. 24.