Martin Shkreli, a lightning rod for growing outrage over soaring prescription drug prices, was arrested in New York by the FBI on Thursday on securities fraud charges involving his former hedge fund and a pharmaceutical company he previously headed.

Shkreli, who is now chief executive officer of Turing Pharmaceuticals and KaloBios Pharmaceuticals Inc, was charged in a federal indictment related to his time managing hedge fund MSMB Capital Management and heading biopharmaceutical company Retrophin Inc.

The indictment, filed in Brooklyn, New York, also charged Evan Greebel, a former partner at law firm Katten Muchin Rosenmann who was Retrophin's outside counsel.

Brooklyn U.S. Attorney Robert Capers is scheduled to hold a press conference with officials from the Federal Bureau of Investigation and U.S. Securities and Exchange Commission at noon EST (1700 GMT) to announce the charges, his office said.

Reuters witnessed Shkreli's arrest at the Murray Hill Tower Apartments in midtown Manhattan. Law enforcement including Federal Bureau of Investigation agents could be seen escorting Shkreli, who was wearing a hoodie, into a car.

FBI spokeswoman Kelly Langmesser confirmed the arrests of Shkreli and Greebel.

Shares of KaloBios fell 53 percent at $11.03 in the premarket before trading in them was halted. Retrophin, which said in a statement that it had fully cooperated with the government investigations of Shkreli, was nearly unchanged in early trading.

Turing and KaloBios declined to comment. A lawyer for Shkreli did not immediately respond to requests for comment. Efforts to reach Greebel were not immediately successful, and a lawyer could not be immediately identified.

A privately held startup, Turing sparked controversy earlier this year after news reports that it had raised the price of Daraprim, a 62-year-old treatment for a dangerous parasitic infection, to $750 a tablet from $13.50 after acquiring it.

The charges predate Turing and relate to Shkreli's management of New York-based hedge fund MSMB Capital Management, whose closure he announced in 2012, and his time as CEO of Retrophin from 2012 to 2014.