Chicago firefighters walk under tape at the scene of a fire that killed several people including multiple children Sunday, Aug. 26, 2018, in Chicago. The cause of the blaze hasn't been determined. (Erin Hooley/Chicago Tribune via AP)

Chicago firefighters walk under tape at the scene of a fire that killed several people including multiple children Sunday, Aug. 26, 2018, in Chicago. The cause of the blaze hasn't been determined. (Erin Hooley/Chicago Tribune via AP)

CHICAGO (AP) — Investigators seeking the cause of Chicago’s deadliest fire in well over a decade were searching the porch area where the blaze started for evidence of fireworks, cigarettes or other smoking materials, a fire official said Monday.

Fire Department spokesman Larry Langford said children had been known to have set off fireworks from the porch of the Southwest Side apartment that caught fire before dawn on Sunday, killing seven children and two adults. People had also used the spot to smoke cigarettes, he said.

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Although investigators haven’t determined what caused the fire, they don’t think it was deliberately set and they have ruled out any problems with the building’s electrical wiring, Langford said. He also said it quickly became clear that the lack of any working smoke detectors turned the fire deadly.

“Because of where it started, (on the rear porch of a rear building), if they had at least one smoke detector, they would have woken up and walked out the front door,” Langford said. “They could have grabbed everyone and made it out a stairway and outside (because) they had a clear shot at the front door.”

Investigators believe some of the kids who were killed in the fire were at the home for a sleepover, he said.

The Cook County Medical Examiner’s Office on Monday publicly identified three of the children who were killed as 3-month-old Amaya Almaraz, 10-year-old Giovanni Monarrez and 16-year-old Victor Mendoza. All three were listed as residents of the block where the fire occurred but, per office policy, their exact addresses were not listed.

By Monday night, the medical examiner also said that 14-year-old Cesar Contreras had died, bringing the total deaths to nine. Another boy, also 14, remained hospitalized, and officials said his condition was too critical for investigators to interview him about what happened.

Autopsies were conducted on the remains of all the victims but the office said it would not release the cause and manner of death until the Fire Department completes its investigation.

Langford said the fire is Chicago’s deadliest blaze since at least 2000 and may be its deadliest since 1993, when 19 people were killed by a fire that swept through the Paxton Hotel, a single-room occupancy residential hotel.

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This story has been corrected to show that the name of the 3-month-old victim is Amaya Almaraz, not Almaraz Amaya.