Navy officials investigating a possible leak at an underground Honolulu facility say they found fuel outside the tank's first layer.
Navy Region Hawaii spokesman Tom Clements says the Navy is working with state and county officials after a discrepancy was found in the tank's levels earlier this week.
He says they've determined there is fuel outside the tank's steel layer, but it wasn't clear whether there was any fuel outside the outer concrete and rock layers.
When operators found the measurement discrepancy, they began transferring fuel immediately to another tank, a process that could take up to five days.
The leak is in the Red Hill Underground Fuel Storage Facility, which held fuel for American planes in World War II.