Radioactive Material

A plant near the most seriously polluted area suffered one of the worst ever radioactive accidents in 1957.

The radiation is not a threat to human health, but it's a previously unknown risk of coastal nuclear power plants.

A total of nine reactors operated at Hanford, and although they are now decommissioned, the reactors have left behind 56 million gallons of radioactive waste.

Greenpeace tests show overall contamination from key isotopes has fallen somewhat, but lingers, especially in places such as forests.

Mexican authorities said they were searching for the missing container on Monday.

The find ends speculation the material could be acquired by Islamic State and used as a weapon.

Environmental and provincial officials fear it could be used as a weapon if acquired by Islamic State.

Criminal gangs are exploiting poor relations between Russia and the West.