President Obama calls Orlando mass shooting 'act of hatred and terror'

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President Barack Obama has ordered flags to be flown at half-staff at the White House and federal buildings until sunset Thursday "as a mark of respect for victims of the act of hatred and terror" at a gay Florida nightclub.

He's also directing the same observance at embassies and other U.S. government facilities abroad.  Obama addressed the nation Sunday, calling the shooting "an act of terror" and an "act of hate."    Fifty were killed, including the shooter, and 53 more hospitalized.  WATCH LIVE COVERAGE IN ORLANDO HERE

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

Local and national hotlines have been established for families seeking information.  You can call 407-246-4357 or 1-800-CALL-FBI (1-800-225-5324).