Police continue to investigate the shelter in place at Haliburton Highlands Secondary School earlier this month.
Haliburton Highlands OPP says on April 4 at 1:22 p.m., officers responded to a weapons complaint at the school in Dysart et al.
Police say they issued a shelter in place order at the school as a precaution, but the search turned up no weapons and no injuries.
The detachment is asking anyone with information on the incident to contact them at 705-286-1431, or Crime Stoppers at 1-800-222-8477.