Twenty-two state, local and federal agencies are following up on more than 1,200 tips in the search for a 7-year-old Portland boy who has been missing for four days.

PORTLAND — Twenty-two state, local and federal agencies are following up on more than 1,200 tips in the search for a 7-year-old Portland boy who has been missing for four days.

Kyron Horman disappeared from Skyline Elementary School on Friday. Multnomah County sheriff's deputies and volunteers have been searching the densely wooded area near the pastoral school since then.

On Monday morning, deputies and FBI agents posted about 40 yards from the school stopped approaching cars and asked passengers whether they were at the school Friday and had any information about Kyron.

Sheriff's Capt. Jason Gates described the variety of tips as "leads that aren't as exciting, and other leads that are more prevalent."

"We need more," he said at a news conference Monday. "Every tip, no matter how insignificant you think it is, could be the one we need."

Speaking again to reporters about four hours later, Gates said authorities have gotten tips from across Oregon and from Washington state. He would not elaborate but said most of the tips were from within Oregon.

Searchers spent the day continuing to comb through woods and brush around the school, located in hilly countryside west of downtown Portland. Gates said Monday's ground search would continue until nightfall.

Authorities also were questioning school employees and parents of children who attend the school.

Kyron was last seen about 9 a.m. Friday, shortly after the boy and his stepmother attended a science fair at the school. She last saw him walking down a hallway toward his second-grade classroom, wearing a "CSI" T-shirt and dark cargo pants.

A search began after classes let out and Kyron didn't come home on the bus. His stepmother called 911 about 3:45 p.m., and sheriff's deputies and K-9 units began a search of the school and the two-mile route to his home.

Authorities have not yet determined whether Kyron was kidnapped or just wandered off, but they're describing him as a "missing endangered child." The FBI has joined the search.

Visitors to the school are assigned badges, but Portland Public School District spokesman Matt Shelby said it would have been difficult to assign a badge to each visitor among the friends and family members who attended the science fair Friday morning.

Authorities were reviewing photos and videos taken at the fair. The last photo of Kyron shows him smiling in front of his project on the red-eyed tree frog.

It was unclear whether Kyron was in class Friday or when anyone noticed he was missing because police have been reticent to disclose public details of the search.

Tip line: 503-261-2847.