Six underground radioactive waste tanks at the nation's most contaminated nuclear site are leaking, Gov. Jay Inslee said Friday.

Inslee made the announcement after meeting with federal officials in Washington, D.C. Last week it was revealed that one of the 177 tanks at south-central Washington's Hanford Nuclear Reservation was leaking liquids. Inslee called the latest news "disturbing."

The tanks, which already are long past their intended 20-year life span, hold millions of gallons of a highly radioactive stew left from decades of plutonium production for nuclear weapons.