Update 9:24 A.M. EDT: The four missing children have been located and are safe, ABC 7 News reports.

The driver of a car that was believed to be carrying four missing children, setting off an Amber Alert in Colorado, has killed himself, ABC 7 News in Denver reports. There is still no sign of the missing children, who range in age from 15 to less than 1 year old.

An Amber Alert was issued Wednesday morning for four missing children: Deaundre McWilliams, 15; Jordan Gunn, 5; Dionna Moore, 1; and a 6-month-old to 9-month-old baby whose name is unknown, according to a posting from the National Center for Missing & Exploited Children.

The Denver Police Department requested the Amber Alert for a portion of Colorado Wednesday morning. The missing children were last seen on the 7700 block of Orchard Avenue in Greenwood Village, Colo.

The car believed to be involved in the abduction was described as a 2000 Chrysler Cirrus with the license plate 774-WYR. Investigators searched the car, which was found in Douglas County, Colo., but the missing children were not inside.

The driver of the car shot and killed himself, ABC 7 News reports. The Denver television station says the same license plate was cited by police in the investigation of a dead body found inside a Denver home. The death was labeled suspicious.