DUBAI  - Iraq's Kerbala refinery is under extensive maintenance and has been non-operational since Sept. 25, a source with direct knowledge of the matter told Reuters.

The source added that the maintenance is expected to last around a month.

The production capacity of the refinery is around 150,000 barrels per day (bpd).

(Reporting by Maha El Dahan; Editing by Edmund Klamann)