The Ukrainian nuclear power agency Energoatom announced on Sunday, that Zaporizhzhia nuclear power plant in Russian-occupied territory in Ukraine has been shut down.

Energoatom said it had disconnected the sixth unit of the plant from the power grid..

Energoatom said it was taking all possible measures to organize an additional supply of diesel fuel for the generators needed to ensure safety at the plant in the absence of an external electricity supply.

The plant has been held by invading Russian troops since March, though it continues to be operated by Ukrainian staff.

A 14-member mission sent by the IAEA last week in its report called for “the immediate establishment of a nuclear safety and security protection zone” around the plant as it faces an “untenable” situation amid frequent shelling that Moscow and Kyiv blame on each other.

In a statement to Russian news agency Interfax, an adviser to the head of the Russian nuclear body Rosenergoatom confirmed that the final power unit had been shut down and that the plant is currently being switched to a cold state.

In the past weeks, only the fifth and sixth power units in the plant have been operating.