PLEASE NOTE: THIS EDIT CONTAINS CONVERTED 4:3 MATERIAL<br/> A blast in the Iranian capital has killed one of the country's nuclear scientists, after a bomb was placed on his car.<br/> This further increasing tensions in a stand-off with the West over the nation's nuclear programme.<br/> Tehran's deputy governor blamed the attack on Israel.<br/> Iran's semi-official Fars news agency said the victim was a "nuclear scientist" who "supervised a department at "Natanz Uranium Enrichment Facility".<br/> This attack comes after Iran's recent announcement that it had started enrichment in the Fordow mountain bunker complex near the city of Qom.<br/> It lies deep underground.<br/> This makes it harder for the US or Israeli forces to carry out veiled threats to use force against Iranian nuclear facilities.<br/> Iran has insisted its nuclear ambitions are purely for civilian use but some Western powers suspect it of having military goals.<br/> Marie-Claire Fennessy, Reuters