Citgo Refining and Chemicals Co. LP has been cited for five safety violations by OSHA, which opened an inspection at the company's Corpus Christi facility upon receiving a complaint that employees had been exposed to a leak of hydrofluoric acid at a flange in the alkylation unit while performing maintenance work.

A seven-person investigation team from the U.S. Chemical Safety Board (CSB) has arrived at the site of an accident reportedly involving the release of hydrofluoric acid (HF) at the CITGO Corpus Christi, Texas alkylation unit.