Police in Florida have arrested nine people who were caught on TV cameras looting sneakers and other goods from a sporting goods store and a pawn shop during Hurricane Irma.
There was a curfew in Miami on Sunday, police reminded the community.
As normality began to return, police commanders said officers would work 12-hour shifts, 24 hours a day, to discourage any more criminality.
"Don't do it", said Miami Police deputy chief Luis Cabrera.
On Sunday night, Miami police took two people into custody and detained two others.
"Can't say we didn't warn you...28 YOs Ryan Cook & Max Saintvil each face 6 counts of burglary from overnight #HurricaneIrma", the department tweeted.
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The Miami Police Department posted a picture of the suspected thieves with the caption, "Thinking about looting?"
Officers have also been busy trawling roads that can be perilous for motorists because power cuts shut off traffic lights at intersections and streets have accumulated shredded vegetation spread by the storm's powerful winds.
Fort Lauderdale police later apprehended and arrested nearly a dozen individuals in the group.
"Going to prison over a pair of sneakers is a fairly bad life choice", said Fort Lauderdale police Chief Rick Maglione.
"Despite the acts of a few criminals and looters, the spirit of Miami is very, very strong." added Commissioner Ken Russell "I'm very proud of the residents and businesses that have come together with such a positive attitude".