(Grants Pass, OR) -- A threat by telephone caused North Valley High School in Grants Pass to go into lockdown Wednesday afternoon. Josephine County Deputies and State Police troopers responded to the school and searched the building. Nothing that would constitute a threat was found. All schools in the Three Rivers School District were placed in "secure" status as a precaution and all schools saw an increased law enforcement presence for the rest of the day. The threat at the high school remains under investigation.