MINSK, Belarus -  Belarus says it has detained a possible suspect in the subway bombing that killed 12 people and wounded more than 200 others.

Deputy Prosecutor General Andrey Shved said Wednesday that CCTV footage showed the Belarusian man leaving a bag in the station in central Minsk.

Authorities earlier said that the bomb apparently was radio-controlled and had been placed under a bench at the Oktyabrskaya station. It exploded Monday as people were coming off trains during the evening rush hour.

There was no claim of responsibility for the blast. Belarus is observing a day of mourning for the victims.