The FBI's arrested a cybersecurity researcher credited with helping to shut down a world-wide cyber attack earlier this year.

Marcus Hutchins - known by his online handle 'MalwareTech' - was detained by officials in Nevada yesterday.

It was not immediately clear what Mr Hutchins was being questioned about.

A friend confirmed he had located Mr Hutchins, and later said the Electronic Frontier Foundation was providing legal representation.

Finally located @MalwareTechBlog, he's in the Las Vegas FBI field office. Can anyone provide legal representation?

— Andrew Mabbitt (@MabbsSec) August 3, 2017

Mr Hutchins was widely praised for detecting a "kill switch" that effectively disabled the global WannaCry ransomware attack in May.