“A noted security researcher has been arrested by the FBI, as first reported by Motherboard. Marcus Hutchins (better known as MalwareTech) appears to have been stopped by the FBI yesterday afternoon as he prepared to board a flight from Las Vegas back to his home in London. Hutchins was in the US for the Black Hat and Defcon security conferences, although he did not present any research.”
Source: WannaCry researcher arrested by FBI for his role in Kronos malware campaign – The Verge