BREAKING UPDATE: Officially now the worst mass shooting in United States history.
More updates at the bottom of the post.

Original story:

In Orlando Florida, approximately 20 people have been killed and by the most recent estimate 42 injured in a shooting at a gay nightclub called The Pulse. UPDATE: At 10:20 this morning, the official death toll was raised to 50, with 53 injured.

From BearingArms:

The attack began at approximately 2:20 AM, where an individual opened fire on club-goers, apparently both inside and outside the club. An officer on the scene providing security for the club engaged the terrorist. As other law enforcement officers responded, the terrorist retreated back inside the club and took hostages.

As news has unfolded, a possible motive has been identified but not confirmed. Initial reports labeled the shooting “domestic terror” but recent reports on social media as well as the major networks including CNN state that the FBI believes the attack may be linked to Islamic Jihad.

FBI: We do have suggestions that that individual may have leanings towards (Jihadi) ideology #PulseNightclubShooting #Orlando

— Jon Williams (@WilliamsJon) June 12, 2016

REPORT: FBI investigating possible radical Islamic 'leanings' of Orlando terrorist https://t.co/6uh8jCvpOH pic.twitter.com/cZlwAGftTj

— Chris (@Chris_1791) June 12, 2016

From the New York Times:

The police classified the attack as a “terror incident., Local and federal authorities were investigating, and the F.B.I. set up a hotline number for tips.

The police and the federal authorities said they were pursuing several angles in the terrorism investigation, both overseas and in the United States.

The gunman was not from the Orlando area and was organized and well-prepared, the police said.

The gunman was found dead inside the Pulse nightclub, one of the largest gay clubs in Orlando, about 5 a.m. after a shootout with officers who were attempting to rescue dozens of people who were being held hostage, said Chief Mina. He confirmed that the gunman had been killed by the police.

The Orlando Police held a press conference this morning and posted the video online:

. @orlandomayor Our community is strong. We will need to help each other's get through this. pic.twitter.com/XyUa8g5PT8

— Orlando Police (@OrlandoPolice) June 12, 2016

There is also this video via the Associated Press where you can hear the gunfire during the shootout with police.
Video of shots being fired.

RAW VIDEO from shooting at Orlando's Pulse, a gay club. Approximately 20 people are dead. https://t.co/aWwEu2tcEghttps://t.co/F7txFUA9mb

— USA TODAY (@USATODAY) June 12, 2016

We will update this post with more information as it becomes available.

UPDATE: Shooter identified as Omar Mateen, Who Made Prior Threats

UPDATE 2: Authorities will hold a press conference at 10:15 a.m. local time.

UPDATE 3: CNN reports this will be an “international investigation.”

UPDATE 4: Tragically, we must report that at 10:20 this morning, officials have raised the death toll in Orlando, Florida to 50. An additional 53 have been injured. Many of the bodies are still in the nightclub.

The hospital reports they brought in several trauma surgeons, including a pediatric trauma surgeon.

UPDATE 5:
Suspect Omar Mateen had a concealed carry license.

Islamic Leader Speaks on Orlando Attack, Clearly Implies Shooting Tied to Gun Control

UPDATE 6: Orlando Shooter Made Pledge Of Allegiance To Islamic State [VIDEO]

UPDATE 7: The left makes it about gun control.