Police call off large-scale search for missing boy with autism (UPDATE)

UPDATE (8 p.m.): Police have called off the large scale search for Omarion Humphrey. The investigation will continue with possibly smaller search teams according to Davison Chief Rick Freeman. 

Freeman said those working the case need to regroup and start again Thursday he said in the 8 p.m. press conference.

No time has been set for smaller searches to head out, Freeman said who added that the FBI is aiding in the investigation.

Freeman cited a lack of solid evidence and are evaluating tips from all sources - including psychics who reached out to police. He said they are not ruling anything out.

He said that is it possible that Humphrey, who has autism and does not speak, could have been taken by a predator. 

Earlier on Wednesday, police bringing have brought in the bloodhounds, stepping up their search for a missing boy with autism.

And this time around, there are no family members allowed - just hundreds of trained search and rescue personnel.

Callis Park was closed to the public Wednesday - so the professionals could do what they do best - working in a strategic fashion to find this missing boy.

"We've hit our inner perimeter, which is a three-mile perimeter," said Davison Township Police Chief Rick Freeman. "Very hard and heavy. And this second wave - we already do have certain sectors in the five mile perimeter."

An amber alert was issued on Saturday, last seen around 5 p.m. at Lake Callis Rec Center in Davison Township.

He has autism, can't talk and was last seen wearing nothing but a black swim suit.

The search is concentrated in the park an area they been through with dogs, horses and ATVs.

"Sometimes re-doing things over and over again our hope is he is still okay," Freeman said. "Our hope is still okay. He is possibly a moving target. And if he is, just because we've checked one place once, doesn't mean we don't need to backtrack and check it again."

While this methodical search unfolds, Freeman asks others within 10 miles of the park to search themselves.

"In some of these more rural areas, we're expanding out into, we expect that there are folks with trail cams, gaming cams out on some properties," he said. "And if you do, we ask that you look - along with other cubbyholes, in cars, under decks, please check your gaming cams for any sign."

Police said canines were able to pick up the boy's scent but each time it was lost when they reached the wood line.  All other tips have come up empty to this point.