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Careful not to get ahead of investigators, Obama did not mention massacre suspect Omar Mateen by name or lay out a possible motive for why he opened fire inside an Orlando gay nightclub, killing 49 people and wounding 53 more.
"We are still learning all the facts," he said. "We've reached no definitive judgment on the precise motivations of the killer.
"What is clear is that he was a person filled with hatred," Obama added. "This could have been any one of our communities. ... As a country, we will be there for Orlando today, tomorrow and for all the days to come."
Obama also praised the officers who risked their lives to rescue the captives trapped inside the nightclub.
Those brave officers, Obama said, prevented the "carnage from being worse."
"This is an especially heartbreaking day for all our friends — our fellow Americans — who are lesbian, gay, bisexual or transgender," he said. "The shooter targeted a nightclub where people came together to be with friends, to dance and to sing and to live."
Once again, Obama decried the ease with which mass murderers can obtain lethal weapons like the Sig Sauer MCX — an AR-15-style rifle — used by Mateen.
"The shooter was apparently armed with a handgun and a powerful assault rifle," he said. " This massacre is therefore a further reminder of how easy it is for someone to get their hands on a weapon that lets them shoot people in a school or in a house of worship or a movie theater or in a nightclub. And we have to decide if that's the kind of country we want to be. And to actively do nothing is a decision, as well."
Obama called for tighter gun control after several other bloody mass murders, including the massacre of 26 students and staff at Sandy Hook Elementary School in Newtown, Connecticut. In January, Obama wept in memory of the slaughtered first-graders as he unveiled a series of executive actions aimed at preventing more mass killings.