<br/>Two suicide bombers targetted Moscow's busy subway system during the Monday morning rush hour today killing at least 40 people and injuring over 30 others in twin blasts. The explosions termed by authorities as a terror attack occurred within 50 minutes of each other at Moscow metro's oldest Red Line stations that are junctions for transfer to other lines. <br/><br/>The incidents occurred near the Kremlin and the Federal Security Service headquarters. The first blast took place at 7.56 am local time at Lubyanka station killing 14 passengers and 11 people waiting on the platform, besides injuring 18 persons. <br/><br/>The second blast took place at the Park Kultury station near the Gorky Park killing at least 15 people and injuring another 12 passengers. Though no organisation has claimed responsibility for carrying out the attacks, Moscow's chief prosecutor said the bombings were caused by suicide bombers wearing belts packed with explosives. <br/><br/>The spokesperson of the Prosecutor's Investigation Committee Vladimir Markin said the case of terror attacks have been opened in the two blasts. Meanwhile, a column of black smoke was seen rising from the Park Kultury metro station and a traffic chaos resulted at the nearby Garden Ring Road. <br/><br/>The rescuers have pressed helicopters into service to evacuate the injured to hospitals. Special buses have been pressed in to take stranded passengers to their destination. The last time Moscow was hit by a terror attack was in August 2004, when a suicide bomber blew her up outside a city subway station, killing 10 people.