PORTLAND, Ore. -- Multnomah County Sheriff's deputies said Friday they continued to make "significant" progress in the search for 7-year-old Kyron Horman, getting tips from across the country and even other nations.
County investigators answered several question via email Friday. MORE: Read the responses
"We are continuing to hope Kyron is alive and will proceed under that premise," deputies said. "Criminal behavior has occurred and we will continue to investigate toward a resolution."
Investigators with the sheriff's office said they had received around 3,300 tips in the case.
No suspects or persons of interest have been named in the case, but deputies said Kyron's step-mother Terri-Moulton has at times not cooperated.
Detectives had not interviewed her since she retained high profile criminal defense attorney Stephen Houze in July.
In court documents, the boy's father Kaine Horman stated police had provided him with "probable cause" to believe that Terri was involved in Kyron's disappearance, plotted to have Kaine killed, and was having a sexual affair.
This past week police have searched the homes of three friends of Kyron Horman's step-mother Terri Moulton-Horman to look for evidence since he disappeared from Skyline Elementary on June 4.
One of those friends was identified by Kyron's parents as DeDe Spicher, and they say she has information about Terri's whereabouts on the day Kyron disappeared. A family statement also said Spicher is not cooperating with the investigation. DETAILS: Friend's home searched
Last weekend, Kaine had Terri evicted from the family's NW Portland home and he returned to the home with Kiara.
"There were numerous questions that could not be answered based upon this being an ongoing investigation," deputies said Friday.
Sheriff's officials also said the media attention has helped to keep the public's attention focused on finding Kyron.
FULL COVERAGE: Search for Kyron Horman