Three metros -- Delhi, Mumbai and Chennai -- and several states including Punjab and Kerala have announced restrictions including big gatherings and night curfew for New Year's eve in view of the coronavirus outbreak. The Centre has advised restrictions to keep large gatherings to a minimum as the highly infectious UK strain of the virus surfaced in the country. Till yesterday, 20 people, all of whom recently returned from the UK, were found to have contracted the new bug. There will be no restrictions in Bengal and Chandigarh.