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WASHINGTON (CBSMiami/AP) — The largest mass shooting in United States history will be addressed by President Barack Obama.

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The White House says President Obama will give a statement Sunday afternoon about the nightclub shooting in Florida.

Obama has been briefed by his homeland security and counterterrorism adviser and has asked for regular updates as the FBI and other federal officials work with police in Orlando, Florida, on the case.

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The White House says Obama has directed federal officials to provide “any necessary assistance to pursue the investigation and support the Orlando community.

Police say a gunman opened fire inside the crowded nightclub early Sunday, killing at least 50 people before dying in a gunfight with SWAT officers.

It was the worst mass shooting in American history. Authorities are investigating it as an act of terrorism.

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