The FBI and Multnomah County Sheriffs are working together in the search for a 7-year-old boy who vanished after his stepmother left him at his Northwest Portland elementary school on Friday morning.
Anyone with information regarding 7-year-old Kyron Horman's whereabouts is asked to call the Multnomah County Sheriff's Office tip line at 503 261-2847, or to dial 911 with emergency information.
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Kyron is described as 3-foot-8 and 50 pounds with brown hair and blue eyes. He was last seen wearing a ``CSI'' T-shirt.
His family has created a Facebook page with pictures and information, which already has more than 4,600 "fans" and counting.
On Twitter, the sheriff's office is providing updates through its Twitter feed at @MultCoSO, while concerned tweeps have set up a #kyronhorman hashtag to forward the tipline phone number and report any breaks in the case.
By Monday afternoon, officials listed almost every major law enforcement bureau within 20 miles as part of the search effort, including Multnomah County Search and Rescue; SearchOne Canine Inc.; the Portland, Gresham, and Fairview Police Departments; the Oregon State Patrol and the FBI.
On Sunday night, Multnomah County Sheriff Dan Staton gave an update on the situation, but not much new information was available.
"Based on everything I know, we will continue to run this operation as a missing child investigation," he said.
Police say Kyron did not return home on the bus as scheduled and the family called the school. The Multnomah County Sheriff's Office was contacted at about 4 p.m.

Authorities have been searching the school and the surrounding area since then.
Multnomah County Sheriff's Office Captain Jason Gates gave a press conference at noon Monday, begging members of the public to stay away from the search site, but "keep the tips coming in."
Gates said "numerous professional search teams" are at work there and "we do not need civilian searchers."
He said more than 1,200 leads have been generated since the child was reported missing last Friday afternoon.
He urged any parents from Skyline School who have not yet spoken with authorities to call the tip line and schedule an interview.
This morning detectives canvassed Skyline Road and passed out flyers to motorists who were driving though the area at about the same time Kyron disappeared.
Capt. Gates said investigators were prioritizing leads and because of that some people may have to wait before being contacted by investigators. He asked that people please be patient and investigators will contact them.
Gates has also asked people living near Skyline Elementary to "search their properties and leave no stone unturned when looking for Kyron." In a statement, the Sheriff's office said "reiterated that our main mission and focus is to bring Kyron Home as soon as we can."
Detectives on Sunday interviewed parents and students at the school to glean any possible information on the disappearance.
A search of the two miles between the school and the boy's home did not turn up any clues, police said.
``The mission is the same as last night; that being to locate Kyron Horman,'' Multnomah County Sheriff's spokeswoman Lt. Mary Lindstrand said.