Northwestern Oklahoma State University has issued the all-clear after the campus was closed for a "potentially dangerous situation" because a questionable substance was found.

: Northwestern Oklahoma State University (NWOSU) announced that the hazardous substance was a vial of picric acid. The substance was recovered by faculty during a routine chemical inventory. Liquid picric acid,

Northwestern Oklahoma State University will be closed for a time on Thursday after the discovery of a potentially hazardous substance on campus.

Northwestern Oklahoma State University will close Thursday morning until 11 a.m. due to a potentially hazardous substance found in the Science Building,

Northwestern Oklahoma State University is closing the campus and canceling classes for Thursday morning after a "questionable substance" was found in the science building.