Japan's Nikkei falls by highest in 5 years 
Japan's Nikkei stock index on Friday fell over 7.9%, registering its biggest daily drop since 2011 and falling to its lowest level since February. The fall comes amid Britain voting to leave the European Union. Meanwhile, trading was briefly halted on the Nikkei for the first time since 2013 as circuit breakers went off following a plunge in the index.