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Four residents were displaced and two apartments deemed uninhabitable after a fire badly damaged a three-story apartment building on Naperville’s north side, officials said.

Firefighters were called to the 2100 block of Allegre Circle,part of the Bristol Station complex near North Aurora Road and Route 59, about 7:15 p.m. Wednesday about a blaze on the building’s second floor, a Naperville Fire Department news release said.

It caused an estimated $20,000 in damage before being extinguished in about seven minutes, the report said.

While fire was contained to unit 209, the apartment below was also damaged.

The cause is under investigation, officials said. No injuries to firefighters or civilians were reported.