Updated

HOUSTON (AP) — A Washington-based research group says two BP refineries in the U.S. account for 97 percent of "egregious willful" violations given by the Occupational Safety and Health Administration.

The study by the Center for Public Integrity says the violations were found in the last three years in BP's Texas City refinery and another plant in Toledo, Ohio. In 2005, 15 people were killed in an explosion at the Texas City refinery.

Deputy Assistant Secretary of Labor for OSHA Jordan Barab says BP has a "systemic safety problem." He told The Associated Press BP has not adequately addressed the issues, despite being fined more than $87 million.

Assistant Secretary of Labor for OSHA David Michaels says similar problems are pervasive throughout the U.S. petroleum industry.