Dallas law firm Jenkens & Gilchrist will close and pay a $76 million fine to settle a federal criminal tax-shelter probe, government officials said Thursday. 
 
The penalty stems from the firm's "promotion of abusive and fraudulent tax shelters in violation of the tax law," the Internal Revenue Service said.

Jenkens & Gilchrist, which had more than 600 attorneys until recently, intends to close its main office in Dallas at the end of the month, after having already closing other offices, the U.S. Attorney's office said.

The firm was shutting down because it realized its illegal activities had "caused serious damage to its reputation, revenues and stability," the U.S. Attorney's office said.

The law firm did not have an immediate comment, but in an earlier statement said, "We deeply regret our involvement in this tax practice, and the serious harm it caused to the United States Treasury."

The IRS said some 1,400 high-net-worth investors followed Jenkens & Gilchrist's advice "and will owe interest and penalties on their underpayment of tax."