Fifty to 60 people are injured in the incidents in the city of Lewiston, though it’s unclear how many are injured due to gunfire, sources told CNN.
“We are encouraging all businesses to lock down and or close while we investigate,” the sheriff’s office said earlier on Wednesday evening (Thursday AEDT).
“Please stay inside your home with the doors locked,” state police said.
“If you see any suspicious activity or individuals please call 911.”
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The Sun Journal newspaper reported law enforcement responded to Sparetime Recreation, a bowling alley on Mollison Way and Schemengees Bar & Grille Restaurant on Lincoln Street.
Lewiston is about 57km north of Portland, Maine, and is the state’s second-largest city.
Auburn is less than three kilometres west from Lewiston.