"Just gotta get the girls out, couldn't do it quick enough," Sgt. James Dalton told WNBC.
"It was one of the bravest things I've ever seen," Edgewater Mayor Michael Joseph McPartland told WNBC.
In addition to the girls' dance studio, the building also held a car wash and a restaurant, WABC reported.
Officials have not been able to determine a cause of the fire, NJ.com reported. No one was seriously hurt, but 10 to 15 girls had minor injuries, according to NJ.com.