HOUSTON, Oct 14 (Reuters) - A prominent Houston law firm

said on Monday it plans to file a lawsuit later this week

against Mexican national oil company Pemex seeking $50 million

in damages for a deadly hydrogen sulfide gas release on Thursday

that killed two workers.

"We anticipate filing our lawsuit in the next day or two,"

said Ryan Pigg, a spokesperson for Houston attorney Tony Buzbee.

"We will seek damages in excess of $50 million for the injuries

our clients sustained as a result of the release."