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.
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.