A blaze that started early Sunday morning in Chicago's Mexican-American Little Village neighborhood killed eight people, including six children, officials say. Investigators say the fire started in the back of the building on the ground floor apartment, which was vacant.According to the Chicago Tribune, the fire happened while two extended families were having a sleepover. The children killed ranged in age from three months to 16 years old. Two other victims have been hospitalized and are listed critical condition, Chicago Fire Department spokesman Larry Langford told NPR.Marcos Contreras, a relative of several of the victims, told the Chicago Tribunethat his sister woke him early Sunday morning and the two ran to the site of the fire."By the time we got here, the whole house was on fire," he said. "They were taking out my cousins and my brothers."Chicago fire officials said Sunday's fire was deadliest in more than a decade, and that no smoke detectors were found or heard at the scene."It was not hard to get out," he told the newspaper. "The fire started in the rear, and the entryway to the front was wide open. Had they been awake or if someone had woken them, they would have gotten out."The victims were identified by Langford as 3-month-old Amayah Almaraz, 3-year-old Alanni Ayala, 5-year-old Ariel Garcia, 5-year-old Gialanni Ayala, 10-year-old Giovanni Ayala, 11-year-old Xavier Contreras, 13-year-old Nathan Contreras and 16-year-old Victor Mendoza. The fire department had earlier reported that some adults were among the dead.On Monday Chicago firefighters passed out safety pamphlets to residents in Little Village and the surrounding neighborhoods."Every time there is a fatal fire we pass out pamphlets and smoke detectors in the community," Langford told NPR.Officials are still investigating the cause of Sunday's fire. Copyright 2018 NPR. To see more, visit http://www.npr.org/.