From CNN's Jennifer Rizzo
New satellite images of an Iranian military base indicate Iranian efforts to cover evidence of a nuclear weapons program, according to a Washington-based think tank.
The DigitalGlobe images, obtained by the Institute for Science and International Security, were taken last week of Iran's Parchin military base, where international inspectors suspect Iran may have conducted explosives tests connected with a possible nuclear weapons program.
Two small buildings at the suspected testing site have been destroyed. Tracks made by heavy machinery supposedly used in the demolition are visible, according to the institute's analysis.
The group says suspected cleanup activity was also seen in satellite images from April. The two buildings were intact in the previous images.
"The newest image raises concerns that Iran is attempting to raze the site prior to allowing an IAEA visit," said the report. "The razing of the two buildings may also indicate that Iran has no intention to allow inspectors access soon."
The International Atomic Energy Agency has requested access to the site, which the Iranians have so far denied. In a letter sent to Iran in May, the agency expressed concern that extensive activity observed in "buildings of interest" could hamper the inspection process.