Nobody hurt in Naperville fire

One unit of a multifamily building was left uninhabitable after a fire Saturday in Naperville, officials said.

Crews arrived just after 3:30 p.m. on the 300 block of Big Rail Drive, according to a news release from the Naperville Fire Department. They initially saw nothing from the outside but found fire inside on the third floor, the release said.

No one was injured, and the cause is under investigation, the release said.