HAMILTON, Ohio (AP) -- Fire spread through a third-story apartment before dawn Friday, killing four children and injuring two others, authorities said.Fire officials got a 911 call shortly after midnight. "I need a life squad, a fire truck. It's a fire and there's babies in the apartment. There's fire rolling up out of the windows," an unidentified person outside the building said in the taped call.The apartment was engulfed in flames when firefighters arrived, Assistant Fire Chief Pete Trautwine said.Autopsies were still being done, but officials said the four victims apparently died from smoke inhalation.Garnett Moss, who said he was the children's great-uncle, said he didn't know where the parents were when the fire broke out. The victims, his niece's children, were two brothers and two sisters ages 6 to 9, he said."They were such good children. It's so hard," said Moss, 53, his voice breaking as he stared at the brick apartment building from across the street.A spokeswoman at Children's Hospital in Cincinnati declined to discuss the injuries to the children treated there, a 4-year-old boy and a 5-year-old girl. Hamilton is about 20 miles north of Cincinnati.Deadly fires also broke out early Friday in Arkansas and Maryland.Three children -- ages 3, 5 and 6 -- were killed in a house fire in Forrest City, Arkansas, and their father was taken to a hospital with burns and cuts, officials said. The mother was apparently able to get out of the one-story wood house and summon help.Investigators suspect the fire was electrical, Fire Chief Dan Curtner said.In Baltimore, two people died in a four-story brick apartment building. An accelerant-sniffing dog detected traces of flammable liquid inside the apartment where the victims were, and a neighbor said she saw four people running out of the building shortly before the fire began.Copyright 2005 The Associated Press. All rights reserved.This material may not be published, broadcast, rewritten, or redistributed.