During a news conference Tuesday morning, Aurora Police Chief Nick Metz said Puckett's family has been notified the body was found and were "devastated". "We are not assuming anything", Metz said.
"Due to the passage of time, the impending weather, and out of an abundance of caution and to leave no stone unturned, CBI has issued an Amber Alert today at approximately 2:40 p.m.", the Police Department stated on Facebook.
McCoy said the authorities are especially concerned for David because it is so cold at night. Police say he voluntarily left and don't believe any foul play is involved.
Police say Fabian doesn't have a history of running away.
Denver-area police agencies and volunteers searched for David on Saturday night and New Year's Day with the help of a helicopter and a bloodhound. The boy's family is fully cooperating and the home has been searched several times, police said. Sobbing and tearful, she stated David is a good boy and very energetic.
The FBI have also reportedly been aiding the police department in conducting "thorough" neighborhood searches and providing their extensive resources.
Sir Andy Murray ends 2016 with victory over Milos Raonic
Berdych put up more of a fight in the second but was unable to find a way back as Nadal set up a semi-final clash with Milos Raonic.
He was last seen wearing a tan jacket, black shirt, green camp trousers and black boots with an orange stripe.
Authorities are also looking for both residential and commercial videos.
The Aurora Police Department has raised awareness by tweeting the hashtag #FindingDavid while providing updates on search efforts around the city. At this point we believe he just wandered off'.
David is described as a white male, 4 feet tall, weighing 48 pounds. He has light brown hair and blue-green eyes.
Police are urging anyone with information about David Puckett or anyone who may have spotted the 6-year-old to immediately call 911 or one of the three tip lines set up by the Aurora Police Department at 303-739-1865, 303-739-1868, and 303-739-1870.