PLEASE NOTE: EDIT CONTAINS CONVERTED 4:3 MATERIAL<br/> <br />At least two people have been killed and 12 injured in an explosion that reduced a nine-storey apartment block to rubble in the Russian city of Astrakhan on Monday (February 27).<br/> <br />Rescue teams have been sifting through the wreckage for 11 people still unaccounted for.<br/> <br />The force of the explosion initially blew away the lower floors but the upper section of the building collapsed later.<br/> <br />The exact cause of the blast is not yet known but a gas leak is most likely to blame<br/> <br />Russian Prime Minister Vladimir Putin has spoken to city officials and ordered the formation of a government commission to investigate the incident.<br/> <br />The wrecked apartment block was part of a housing complex in Astrakhan, 1, 300 kilometres southeast of Moscow.
