The first exploded at 17:33 on a crowded train between the Izmailovskaya and Pervomaiskaya stations of the Moscow Metro.[4] At 18:05, the second bomb detonated inside a grocery store close to KGB headquarters. Five minutes later, the third bomb exploded near another grocery store on 25 October Street, just a few hundred meters away from the headquarters of the Communist Party of the Soviet Union.[4]