The Lavizan Shiyan Technical Research Centre, in a north-eastern suburb of the city, has been under mounting suspicion of harbouring secret military activities since it was named by an Iranian opposition group in 2003.

Now two commercial satellite images, the first on 11 August 2003 and the second on 22 March 2004, show that the site's buildings have been razed, its features obliterated and its ground cleared.

"The images show that Iran has taken dramatic steps that make it difficult to discover what was happening there," says Corey Hinderstein from the Institute for Science and International Security in Washington DC. It was the institute which found and released the photographs.

Independent nuclear experts regard the satellite photographs of Lavizan Shiyan as important new evidence. "Iran is clearly trying to hide something - and there is suggestive, though not conclusive, evidence that the something is nuclear," says Matt Bunn, a nuclear policy adviser to former US President Bill Clinton, now at Harvard University. "Iran clearly owes the world an explanation."
--------------------------------------------------------------