Via Times of Israel:

Inspectors from the UN atomic agency discovered uranium enriched to 84-percent purity in Iran last week, closer than ever to weapons-grade levels, Bloomberg reported Sunday, citing two unnamed senior diplomats.

Iran has been known thus far to have enriched uranium to 60%. A purity of 90% is needed to produce nuclear weapons.

International Atomic Energy Agency inspectors are trying to determine whether Tehran deliberately made the move or if it was an “unintended accumulation within the network of pipes connecting the hundreds of fast-spinning centrifuges used to separate the isotopes,” the report said.