FBI launch probe after Uber users say phantom cab riders appear on their accounts

The FBI has launched an investigation into reports that British and U.S. users of taxi app Uber are being charged for 'phantom' rides they never took.
http://www.dailymail.co.uk/news/article-3095116/FBI-launch-probe-British-Uber-users-say-phantom-cab-riders-appear-accounts.html
THE FBI OPERATES IN BRITAIN?