Officials released a 43-page report and surveillance video that shows the fire may have been burning for seven minutes before any 911 calls were made back on January 27th.
A video timeline constructed by city staff in response to a Des Plaines City Council request for analysis of what happened, shows angles captured from Metropolitan Water Reclamation Facilities across the street and first responder body cams
The fire broke out at about 10:13 a.m. in the 700-block of West Oakton Street.
"Our emergency personnel arrived on site and worked valiantly to try and save lives," said Ald. Andrew Goczkowski, Des Plaines 8th Ward.
After firefighters arrived on scene, it took just 13 minutes for them to pull all five people out of the apartment.
The exact cause of the fire is still under investigation but authorities said a space heater and extension cord were found near the stairwell where the fire started.
That stairwell was the only exit out of the upstairs apartment where Cythlaly Zamudio and her four daughters were found.
The four sisters who died were identified by their family as Grace Nicole Espinosa Zamudio, 1, Allison Valentina Espinosa Zamudio, 3, Genesis Aislinn Espinosa Zamudio, 5, and Renata Paulette Espinosa Zamudio, 6.
The children were taken to hospitals and pronounced dead, while their mother, Nancy Cithlaly Zamudio Rodriguez, 25, died at the scene, officials said.
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The century-old home was legally subdivided into four apartments and lacked smoke detectors, according to the report.
Over the years, the landlord has had some code violations according to Goczkowski.
"The city council will be revisiting our codes and ordinances related to rental dwellings to ensure that we are adhering to best practices," Goczkowski's statement said.
A city source told ABC 7 Chicago there was no delay in response to the fire and that a ladder truck was at the scene and was not needed.