Police are looking for Celena Romero, who is 5 feet 1 inch tall and 90 pounds. She has green eyes, blonde, shoulder-length hair and was last seen wearing a black jacket and jeans. She looks older than 11.
The boy, Charlie Romero, is 4 feet 3 inches tall, about 50 pounds with blue eyes. He has blond hair shaved into a Mohawk. He was last seen wearing a Denver Broncos jacket and jeans.
They were last seen at a bus stop in the 9400 Block of Elm Court in Federal Heights around 3:30 p.m. on Thursday.
Police believe the children are with their mother and her boyfriend, 35-year-old Tammy Anne Rees-Romero and 22-year-old Jacob Lawrence Lake-Sahm.
Lieutenant Gary Toldnes with the Federal Heights Police says the children are under the care of Denver County Social Services and were living with foster parents at the time of their disappearance. The foster parents told authorities the children may have packed extra clothing in their backpacks when they went to school on Thursday.
Officers also found .38-caliber ammunition and moving boxes at the biological mother's home when trying to find the children.
Rees-Romero is described as 5 feet 3 inches tall, 140 pounds with hazel eyes and red, shoulder-length hair.
Lake-Sahm is 5 feet 8 inches tall, 130 pounds with brown eyes and short brown hair. He also has a short beard.
Authorities believe they are in a 1997 maroon Mercury sedan with Colorado license plate 618-SZM.
Anyone with information about the children, the adults or the car is asked to call their local law enforcement agency. Police believe the children may be in danger.
(KUSA-TV © 2011 Multimedia Holdings Corporation)