An explosion on a train at a St. Petersburg, Russia, subway station killed at least 14 people and injured dozens on Monday afternoon.
President Vladimir Putin, who was in St. Petersburg at the time, said the cause of the blast wasn’t yet clear but authorities were investigating.
Russia’s National Anti-Terrorism Committee said it found and deactivated a bomb containing shrapnel at Vosstaniya Square station, also in St. Petersburg, according to the Associated Press.
Russian law enforcement agencies were hunting for two suspects, said the Interfax news agency. Authorities later determined that a suicide bomber was behind the explosion and that the suspect was a Kyrgyz-born Russian citizen. There was no immediate claim of responsibility for the attack.
In a statement, U.S. State Department acting spokesman Mark Toner said the U.S. condemned the attack. “We extend our deepest condolences to the loved ones of those who were killed, and our thoughts and prayers are with those injured in the attack and with the Russian people,” he said.