Americans were joined in "distress, shock and take steps to safeguard our kin", he said.
Omar Mateen, 29, executed 50 individuals and injured 53 at the Pulse club before being shot dead by police.
The supposed Islamic State bunch has said it was behind the assault, yet the degree of its inclusion is not clear.
What we know
An announcement on its subsidiary Amaq news organization said that an IS "warrior" was dependable.
NBC News reported that Mateen had called the crisis administrations before the assault and swore faithfulness to IS.
The shooter was executed in a trade of flame with 11 cops, in the wake of taking prisoners at the club.
The assault is the most exceedingly awful mass shooting in late US history.
Seven of the casualties have so far been named - Edward Sotomayor Jr, Stanley Almodovar III, Luis Omar Ocasio-Capo, Juan Ramon Guerrero, Eric Ivan Ortiz-Rivera, Peter O Gonzalez-Cruz and Luis S Vielma.
An across the country snippet of hush was held at 18:00 nearby time (22:00 GMT).
In an obviously inconsequential occasion, an intensely equipped man was captured in southern California subsequent to stating he needed to assault a gay pride occasion in Los Angeles.
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| suspect :Omar Mateen |
Firearm control
Mr Obama said the "severe homicide of many pure individuals" was a further indication of that it was so natural to secure a lethal weapon in the US and shoot individuals.
"We need to choose if that is the sort of nation we need to be," said the president, who has battled for stricter weapon laws. "To effectively do nothing is a choice also."
He included that it was a shocking day for the LGBT people group, and that an assault on any American was an assault on all.
The assault is the most noticeably bad mass shooting in late US history.
Seven of the casualties have so far been named - Edward Sotomayor Jr, Stanley Almodovar III, Luis Omar Ocasio-Capo, Juan Ramon Guerrero, Eric Ivan Ortiz-Rivera, Peter O Gonzalez-Cruz and Luis S Vielma.
An across the nation snippet of hush was held at 18:00 neighborhood time (22:00 GMT).
In a clearly disconnected occasion, a vigorously equipped man was captured in southern California in the wake of saying he needed to assault a gay pride occasion in Los Angeles.
Weapon control
Mr Obama said the "fierce homicide of many blameless individuals" was a further indication of that it was so natural to procure a destructive weapon in the US and shoot individuals.
"We need to choose if that is the sort of nation we need to be," said the president, who has crusaded for stricter firearm laws. "To effectively do nothing is a choice too."
He included that it was an awful day for the LGBT people group, and that an assault on any American was an assault on all.
Mr Obama has requested banners on government structures to be flown at half pole until dusk on Thursday.
Later the White House said Mr Obama had deferred a joint appearance with the Democratic Party's hypothetical chosen one for president, Hillary Clinton.
Mrs Clinton said she was a "partner" of the gay group and utilized an announcement to push for more tightly weapon controls. She said: "This reminds us afresh that weapons of war have no spot on our roads."
In a message to LGBT (lesbian, gay, swinger and transgender) individuals, she said: "We will continue battling for your entitlement to live unreservedly, straightforwardly and without trepidation. Despise has truly no spot in America."
'Get intense and brilliant'
Then her Republican adversary, Donald Trump, said Mr Obama ought to venture down for declining to utilize the words "radical Islam" while denouncing the assault.
"In the event that we don't get intense and savvy genuine quick, we are not going to have a nation any more," he said.
Mateen, a US native of Afghan plummet who was conceived in New York and lived in Florida, was not on a terrorism watch list.
In any case, authorities uncovered that the FBI had twice talked with him in 2013-14 after he made "incendiary comments" to a partner, before shutting their examination.
Inquiries are being gotten some information about how somebody who related to IS could secure military-grade weapons.
It rose that he had lawfully obtained a few weapons in the previous few days.
Mateen worked for a security organization and had a guns permit that was because of terminate in 2017.
The loss of life implies that the Orlando assault surpasses the 2007 slaughter at Virginia Tech, which left 32 individuals dead.
Highly sensitive situations have been proclaimed in the city of Orlando and encompassing Orange County.
Security was helped for the most recent day of the Capital Pride LGBT celebration in Washington DC, which incorporated a minute of hush for the Orlando casualties at 13:00 neighborhood time.
A gay pride parade has additionally been occurring in West Hollywood, Los Angeles. The city's leader said police in the adjacent city of Santa Monica had captured an intensely furnished man who said he needed to hurt the parade.
He was later recognized as James Howell from the condition of Indiana. He is not known not any association with the Florida shooter.
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