The world's largest mobile phone showcase, the Mobile World Congress (MWC), has been cancelled over coronavirus concerns. The event was due to be held in Barcelona on the 24-27 February. More than 100,000 people usually attend the annual event, about 6,000 of whom travel from China. The GSM Association has said it had become "impossible" for the event to go ahead as planned. Facebook, LG, Nokia, Sony and Vodafone were some of the high-profile exhibitors who had pulled out of the annual event, citing coronavirus fears.