Hilcorp told Alaska regulators on 19 February it had cut pressure on the line to 165 pounds per square inch, with an estimated leak rate between 210,000 and 310,000 cubic feet per day.

The operator had previously reduced pressure from 195 psi to 185 psi with an estimated leak rate between 225,000 to 325,000 cubic feet per day.

It is not yet known how much natural gas has been released.

The