Categories News Omar Mateen — Threatened to Shoot Up His School … in Fifth Grade!! Post author By crystalg Post date June 14, 2016 Read more at… TMZ.com Tags fifth, Grade, Mateen, Omar, School, Shoot’, threatened ← Beyonce helps raise over $82,000 for Flint residents → MSNBC Panel Rips Trump’s “Racist” Insinuation That Obama Supports Terrorism