Iran has launched a speedy cleanup operation at a nuclear-related site in northern Tehran hit by Israeli airstrikes that will likely remove evidence of any nuclear weapons development work, a research group said on Wednesday.

Satellite imagery "shows a significant effort by Iran to rapidly demolish damaged or destroyed buildings, likely to sanitize any incriminating nuclear weapons research and development activities," the Institute for Science and International Security said.

The institute is an independent research group that focuses on stopping the spread of nuclear weapons and is headed by David Albright, a former U.N. nuclear inspector.