(CHRISTIANPOST) — ORLANDO, Fla – President Barack Obama on Sunday described the worst mass shooting in U.S. history as “an act of terror” and “an act of hate,” saying the massacre of 50 people at a packed gay nightclub by gunman Omar Mateen of Ft. Pierce, Florida, was an attack on all Americans.

Islamic State’s Amaq news agency said on Sunday that the Islamist militant group was responsible for the massacre.

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“The armed attack that targeted a gay night club in the city of Orlando in the American state of Florida which left over 100 people dead or injured was carried out by an Islamic State fighter,” Amaq said.

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