A manhole cover exploded Thursday night in Providence, Rhode Island, leaving most of the city's mall and surrounding areas without power, according to necn affiliate WJAR.
Providence Fire responded around 8:15 p.m. to reports of the explosion.
An employee told WJAR that Macy's and Nordstrom were the only stores at the Providence Place Mall with power.
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Fire officials say four people were freed after being trapped in elevators. Authorities said everyone was able to make it out of the mall safely.
While the mall has a backup generator, authorities say it did not kick in.
National Grid told WJAR around 10 p.m. that power had been restored to all but 300 of its customers.