Experts have warned that Iran has allegedly carried out a clean-up drive at a building suspected of being used for experimenting nuclear weapons at the Parchin site outside Tehran.
According to the Institute for Science and International Security (ISIS), that closely follows the Iranian nuclear program, new satellite pictures reveal that unusual activity has taken place in recent weeks at the military facility.
A large stream of water was flowing from the building, which is believed to feature an "explosive chamber" for testing, raising concerns that Iran may have been washing inside the building", according to ISIS.
The satellite pictures taken on April 9 had showed a series of unidentified items lined up outside the building.
However, pictures taken in March and in July 2011 showed neither, suggesting unusual recent activities.
David Albright, founder of the ISIS, has said its finding have backed up concerns at the International Atomic Energy Agency (IAEA), which has been denied access to the site since 2005, over recent activity there.
"Iran should immediately allow IAEA inspectors into the Parchin site and allow access to this specific building," Albright said, a former inspector. "It should also explain the purpose of the activities".
Yukiya Amano, the IAEA Director General, earlier this year said that he had information that "activity is ongoing" at the site, which is at the centre of the controversy over Iran's nuclear scheme.
The IAEA believes that a large explosives containment chamber was installed at the complex in 2000 for explosives experiments that are "strong indicators of possible weapons development."
Tehran insists its programme remains devoted to peaceful technology and that concerns to the contrary are based on "fake evidence". (ANI)