The government on Friday ordered an overnight lockdown at a building in Sai Wan Ho after a resident who was exempted from hotel quarantine tested preliminary positive for Covid-19. The resident, 55, works for the Russian consulate and was allowed to serve his quarantine at his home in Tower 1 of Grand Promenade after returning from Russia via Finland on October 5. He tested positive on Thursday for the L452R mutant strain. Residents will have to stay in the building until testing is completed. Officials hope to end the lockdown by 7am on Saturday.