KIM'S DISASTER North Korea nuclear tunnel COLLAPSES ‘killing at least 200 people’ amid fears of a massive radioactive leak The collapse happened at the Punggye-ri nuclear test site in the country's north-east on October 10.

The hunt is on for the source of low level radiation detected in the atmosphere "across Europe" over the past weeks, nuclear officials said today.

Trace amounts of iodine-131, a type of radiation created during the operation of nuclear reactors or in the detonation of a nuclear weapon, were detected as early as three weeks ago by Austrian authorities and then two weeks ago by the Czech Republic's State Office for Nuclear Safety. Today the International Atomic Energy Agency released a statement revealing similar detections had been made "in other locations across Europe."

The IAEA said it does not believe the radiation was left over from the nuclear disaster at Japan's Fukushima Daiichi plant in March and the Czech Republic's State Office for Nuclear Safety said it was unlikely to have been caused by an incident at any nuclear plant's core.

"Anywhere spent nuclear fuel is handled, there is a chance that... iodine-131 will escape into the environment," the U.S. Environmental Protection Agency says on its website.