The U.S. military's strike on three sites in Iran raised urgent questions Sunday about what remains of Tehran’s nuclear program and how its weakened military might respond. The decision to directly involve the U.

The world grappled Sunday with the enormous implications after the United States inserted itself into Israel’s war against Iran with an attack that raised urgent questions about what remained of

With the United States joining Israel in its attacks on Iran’s nuclear program, here is what we know about the radiation threat, and other health risks. No elevated radiation levels detected yet Iran enriches uranium at two key sites,