By Nicole Jao

NEW YORK, May 28 (Reuters) - Citgo's [RIC:RIC:PDVSAC.UL] 165,000-barrel per day oil refinery in Corpus Christi, Texas, caught fire on Thursday, which resulted in heavy smoke, the company said.

A pump at the Citgo Refinery East Plant tank farm caught fire on Thursday afternoon, Citgo said in a statement. Refinery operations were not affected and no injuries occurred.

The company is investigating the cause of the fire.