By Jonathan Landay

WASHINGTON (Reuters) -Iran has launched a speedy clean-up 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.

Iran's embassy to the United Nations did not immediately respond to a request for comment. Tehran denies seeking nuclear weapons and repeatedly has said its program is for peaceful purposes.

The........

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