The fire broke out in a tunnel between the Biblioteka Imeni Lenina and Okhotny Ryad, two stations of the Moscow Metro’s oldest Sokolnicheskaya line, the agency said.
“A power cable caught fire, evacuation is underway,” the Russian emergencies ministry’s press office told the agency.
It wasn’t clear exactly how many people were injured.
RIA Novosti said one passenger suffered from smoke inhalation. The Interfax news agency said the injured numbered 12.