British Prime Minister Boris Johnson is set to unveil an alert system on Sunday to monitor the nationwide coronavirus outbreak, with different levels informing how and where the lockdown could be eased. He will set out the plan in a televised address to the nation at 7:00pm (1800 GMT), as part of a wider strategy on how stay-at-home measures imposed in late March might be gradually eased. The alert system will be monitored from a new centre for bio-security and have five levels, informing the public and policy makers of the...