Messages claiming Iran nuclear site fire deepen mystery

This Friday, July 3, 2020 satellite image from Planet Labs Inc. that has been annotated by experts at the James Martin Center for Nonproliferation Studies at Middlebury Institute of International Studies shows a damaged building after a fire and explosion at Iran's Natanz nuclear site. An online video and messages purportedly claiming responsibility for a fire that analysts say damaged a centrifuge assembly plant at Iran's underground Natanz nuclear site deepened the mystery Friday around the incident even as Tehran insisted it knew the cause but would not make it public due to "security reasons." (Planet Labs Inc., James Martin Center for Nonproliferation Studies at Middlebury Institute of International Studies via AP)