American entrepreneur Martin Shkreli, who hiked the price of a life-saving drug by 5000%, has been arrested by the FBI.
The 32-year-old' has been detained on suspicion of fraud relating to a drug company he used to run, which isn't connected to his current firm.
Mr Shkreli is accused of illegally taking stock from Retrophin Inc, a company he started in 2011.
In September, he was criticised after buying the rights to the HIV and malaria medicine, Daraprim, and then charging around 800 dollars per tablet.
The arrest has nothing to do with his pricing of pharmaceutical drugs.