Six Massey Energy officials, including the company's top safety officer, are refusing to answer investigators' questions into April's West Virginia mine disaster.
According to documents obtained by The Charleston Gazette under the West Virginia Freedom of Information Act, the officials invoked their Fifth Amendment right against self incrimination and will not appear for interviews.
Among them are Elizabeth Chamberlin, Massey's vice president for safety.
The others are Jamie Ferguson, vice president of Massey subsidiary Performance Coal; Wayne Persinger, a general manager at the mine; mine maintenance chief Rick Nicolau and mine foremen Rick Foster and Gary May.
The explosion killed 29 miners and is the target of civil and criminal investigations.
Information from: The Charleston Gazette, http://www.wvgazette.com