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UPDATE: The four people injured in an early-morning fire have all been treated and released from area hospitals, according to a city press release.

The fire in the 5000 block of Bay Circle was called under control at 3:05 a.m.

The four injured — one of the homeowners and three firefighters — have all been treated and released from local hospitals.

Four of the five family pets have been located, the press release stated. However, a cat is still missing.

The cause appears related to a chimney fire, but is still under investigation.

Earlier: One citizen and three firefighters were injured in a fire early Sunday.

Suffolk Fire & Rescue units remain on the scene of the working residential structure fire in the 5000 block of Bay Circle that was reported shortly before 1 a.m., according to a city press release.

Emergency Communications was contacted at 12:53 a.m., and the first unit arrived on scene in the Holly Acres neighborhood at 1:04 a.m., the press release stated.

First arriving fire units found heavy smoke and flames showing from the two-story residence. The occupants were alerted by a smoke detector and had evacuated prior to their arrival.

An adult female received emergency medical assessment and treatment and was ground transported to a local hospital for further treatment and is in stable condition.

Three firefighters sustained injuries due to a wall collapse. They also received emergency medical assessment and treatment and were ground transported to a local hospital and are also currently in stable condition.

Responding units include Engines 2, 10, and 25; EMS 1 and 2; Ladder 5; Medics 5, 9, and 10; Rescue 1, Safety 1, and Battalions 1 and 2.

Suffolk Police also responded, and Bay Circle is completely shut down to Respass Beach Road.

Two adults will be displaced. The Fire Marshal’s Office will be investigating the cause of the fire.