Slain Iranian nuclear scientists raises alarm over uranium, expertise reaching black market

The killing of Iranian nuclear scientists in U.S.-Israeli military strikes has raised fears that, if the regime destabilizes, weakened control over uranium stockpiles and the spread of nuclear expertise could increase proliferation risks.

While Iran can replace its lost personnel, experts say the lost expertise will be harder to rebuild and undisclosed sites in the country may also leave dangerous materials and knowledge vulnerable.

"Currently, the risk of nuclear terrorism or nuclear...