A police officer explains to a motorist at a temporary checkpoint how to properly wear a mask during a partial lockdown to help control the spread of the coronavirus, in Karachi, Pakistan, Saturday, July 31, 2021. Pakistan's Sindh provincial authorities started implementing a plan of a nine-day partial lockdown from July 31 to August 8. New restrictions also include closure of all tourist resorts, beaches, hotels, restaurants, shopping centers, parks and other public places to try to control the spread of the coronavirus. (AP Photo/Fareed Khan)