BEIRUT, Aug 31 (Reuters) - A fire broke out at the Bu Ali Sina petrochemical refinery, the Tasnim news agency reported on Wednesday.

No reason was given for the cause of the fire at the oil complex, which is in the southwest city of Bandar Mahshahr, nor did Tasnim say how much damage it had caused.

The same complex caught fire in early July and one of the tanks was destroyed, according to Tasnim.

(Reporting by Babak Dehghanpisheh; Editing by Louise Ireland) ((babak.dehghanpisheh@thomsonreuters.com;))