The father of the man authorities say opened fire at a gay Florida nightclub in a massacre that left 49 victims dead says the attack goes against everything he taught his son.

Speaking to reporters Monday morning, Seddique Mir Mateen — the father of gunman Omar Mateen — said the attack was against his principles and against what he taught his son.

Seddique Mir Mateen said the family is shocked by what happened and that if he’d known what his son was planning, he would have arrested him himself.

Authorities say Omar Mateen opened fire with an AR-15 rifle at a gay nightclub early Sunday before being killed in a shootout with police. Another 53 people were wounded in the shooting.

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