Residents of Ogun state in Nigeria face will arrest if found not to be wearing face masks in public, police spokesman Abimbola Oyeyemi says.
The state is considered as a coronavirus hot spot and a 35-day lockdown ended there last week.
Governor Dapo Abiodun had ordered mandatory mask-wearing as a precaution to stop the spread of coronavirus.
The order took effect on 1 May, but local leaders say people are not complying.
Enforcement will begin this weekend, the police say.
Those arrested will be quarantined for 14 days and will do community work.
Ogun state has so far recorded 100 coronavirus cases and is close to the commercial hub of Lagos – another coronavirus hot spot.
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