A high school in the US which stirred up controversy over teachers’ Halloween outfits have hit back at online agitators .

Mathematics teachers at Cienega High School in Tuscon, Arizona, posed for a photo wearing blood-stained shirts with the words “problem solved” printed on the front for Halloween.

WATCH ABOVE: School superintendent issues statement following Charlie Kirk controversy

The image went viral online with a number of social media users claiming the shirts mocked the assassination of right wing political commentator Charlie Kirk.

Kirk was shot in the neck and killed while speaking to students at Utah Valley University in September, sending shockwaves through the American political landscape.

Republican senator for Arizona Jake Hoffman fanned the flames of online vitriol

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