Controversial former pharmaceuticals boss Martin Shkreli has refused to speak at his Congress hearing over drugs prices.

The former hedge fund manager was summoned to the House Committee on Oversight and Government Reform at Congress after his company, Turing Pharmaceuticals, raised the price of a life-saving drug by 5,000%.

But Mr Shrkeli's lawyer informed the committee that he would invoke his right to plead the 5th amendment so as not to self-incriminate.

In a statement, Congressman Elijah Cummings, a member of the committee said: "If he plans on trying to use his own intentional inaction as some kind of bogus excuse for not showing up at Tuesday's hearing, people will see right through such a juvenile tactic."

Mr Shkreli is also facing separate criminal charges. He was arrested in New York in December on suspicion he defrauded investors at his former drug company, Retrophin, and hedge fund MSMB Capital Management, where he was a fund manager.

He was granted bail and denies the charges.

The criminal charges do not relate to his activities as chief executive of Turing Pharmaceuticals, but he stepped down from the role following his arrest.