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11:15 AM PT -- There are now reports Omar Mateen called 911 and pledged his allegiance to ISIS before carrying out the deadly shooting. He also mentioned the Boston Marathon bombing.

ISIS is taking credit for the attack, saying, "a soldier of the Islamic State has carried out the attack."

The killer in the Orlando nightclub slaughter is 29-year-old Omar Mateen. TMZ has done a records search and found he held a Florida security officer license and a state firearms license.

He's an American citizen and he has family that are not -- his parents are Afghan. Authorities say he was a terrorist and was targeting gays. They say in addition to terrorism this is a hate crime.

Authorities also believe he is part of the radical Islam movement, although they do not know if it was an organized attack or if he was a lone wolf. Authorities also believe Mateen specifically targeted a gay club.

Mateen's father told NBC News, "This has nothing to do with religion." He says his son became angry after seeing 2 men kissing a few months ago in Miami, and he speculates that could have triggered his decision to kill.

Law enforcement says Mateen was well prepared, with an assault weapon, a handgun and 2 suspicious devices.

The NYPD tells TMZ, Mateen has no association with the department, and that the shirts he was photographed in were unofficial garments that could be purchased at any store.

50 people were murdered and another 53 injured inside Pulse nightclub in Orlando. It's the biggest slaughter at the hands of a gunman in American history.

Take a look at the pic below ... it's a police helmet with a bullet hole. The helmet saved the officer's life, although he suffered facial injuries.

Police descended on Mateen's home to search shortly after the massacre.

President Obama just addressed the nation on the tragic Orlando shooting ... and vowed to make all resources available to aid the FBI in their investigation.

Obama said the shooting carried out by Omar Mateen is not only a tragedy to the United States ... but a heartbreak to everyone in the LGBT community.

Selena Gomez broke down in tears Saturday night as she dedicated a song to former "Voice" contestant Christina Grimmie, who was gunned down Friday night after an Orlando concert.

It was very personal ... Selena's stepdad signed Christina when she was just 14 to manage her singing career. Selena was Christina's mentor.

Gomez dedicated "Nobody" to Christina.

As we reported, Christina was gunned down during a meet-and-greet by an obsessed fan.

The Pride parade Sunday in West Hollywood will have enormous law enforcement presence, but we're told it's not because of the Orlando massacre ... it's because of the state of the world.

Law enforcement tells TMZ, a plan was already in place for a huge showing of L.A. County Sheriff's deputies at the parade. We're told all of them will have "shooter gear" on their persons, and in the patrol cars.

We're told the Department put its plan in place because of the high concentration of spectators, the nature of the event and the state of terrorism in the world. They have not changed their plan in the wake of the Orlando gay nightclub murders.

Princess Charlotte is only 1, but she already knows how to wave to her subjects.

Kate Middleton held her youngest Saturday at Buckingham Palace ... for the Trooping of the Colour. It's all part of the celebration of Queen Elizabeth's 90th birthday.

Kate and William definitely make cute kids.

The slaughter at an Orlando nightclub Saturday night that ended the lives of 50 people was an act of terrorism ... and the culprit appears, again, to have radical Islamic leanings.

Law enforcement officials say in addition to an assault rifle and a handgun with which 29-year-old Omar Mateen opened fire in Pulse nightclub, he had a "suspicious device." There was another device in his car.

50 people were taken to the hospital. It was so horrific the city ran out of ambulances and the wounded were taken to the hospital in the beds of pickup trucks.

The FBI says it's unclear if this was an organized attack or a lone wolf. The killer, law enforcement says, was well-prepared.

The gunman held hostages for more than 2 hours and a SWAT team was able to get the shot and kill him.

A gunman opened fire inside a gay nightclub early Sunday morning in Orlando -- injuring multiple club goers, before engaging in a gun battle with police.

50 people are dead an 50 more wounded. Police also say the shooter is dead inside Pulse Nightclub.

"Everyone get out of Pulse and keep running" ... was posted on the club's Facebook page shortly after the shooting began. Videos and photos flooded social media, several showed a standoff -- apparently between cops and the shooter.

The mass shooting happened 24 hours after singer Christina Grimmie was murdered In Orlando ... during a fan meet and greet following her concert.

Blac Chyna and Rob Kardashian have made a radical sea change ... they now want a TV special for their wedding, more than a million bucks, and they want the Kardashian girls there in force.

BC and Rob just signed on for a docu-series that will focus on her pregnancy, but the wedding is not part of the package.

Now we know why ... Chyna and Rob know that Kim scored millions when her ill-fated wedding to Kris Humphries was televised. They know they won't get Kim's money, but they feel more than worthy to get what Kris got, and they're insisting on 7 figures.

Michu Meszaros -- the guy who played ALF in the '80s -- is fighting for his life after slipping into a coma ... TMZ has learned.

Michu's manager, Dennis Varga, tells us the 2'9" actor had been dealing with health issues after suffering a stroke 8 years ago.

Dennis says late last week he called 911 after finding 76-year-old Michu unresponsive in the bathroom.

Michu was taken to an L.A. area hospital where he remains in a coma ... and the prognosis is bad.

Dennis says Michu gave him strict instructions not to take him off life support.

Michu got his start at Ringling Bros. and Barnum & Bailey Circus before landing the role of ALF the alien. ALF was a puppet but Michu wore the costume when they needed walking/running shots.

Michu also did a cameo in "Big Top Pee-wee" ... and 2 Pepsi commercials with Michael Jackson.

Erin Andrews isn't gonna let her hotel peeping Tom slide on his debt, even though he's gone belly-up, financially.

The Abbey's ready to burst with boys and vodka when hundreds of thousands descend on West Hollywood this weekend for L.A. Pride.

The Abbey has stocked the place with more than 1,000 liters of vodka, 3,500 cans of Red Bull and 7,500 bottles of beer. And there's plenty of eye candy for the boys AND girls -- 100 go-go dancers.

The Abbey -- once reportedly the largest purchaser of vodka in the world -- is expecting between 30-50k booze-guzzling customers.

When T.I. is opening up a new strip club, strippers come out in force ... as in 1,600 strong lining up to prove their worthy of a pole position.

The rapper and his partner, Damon Cobbs, are launching a V Live in Atlanta later this month, so they held a job fair -- of sorts -- a few days ago. Recruiters were looking at several criteria beyond dancing skills.

We're told a well-rounded butt, toned body and tight abs put most candidates over the top, and of course ... great personality was a must.

Motorhead's Lemmy Kilmister's memory will live forever at his rock 'n' roll home -- The Rainbow Bar & Grill.

The famed restaurant/bar is a coveted part of the Sunset Strip ... the place John Belushi had his last meal the night he died, the joint where John Lennon threw back drinks, and the favorite haunt of Led Zeppelin, Elton John and countless other rock stars and celebrities.

The patio area at The Rainbow Bar & Grill is being renovated and re-named "Lemmy's Lounge" ... it's the place Lemmy always hung before his death last December. In an awesome move, they're using Lemmy's favorite bar stool as a focal point of the redesign.

And there's a $20k bronze life-size Lemmy statue.

Kanye West has got his good looks on lockdown.

Here’s a 26-year-old version of the Chicago bred rapper at a festival in 2004 (left) and 13 years later ... the freestyle phenomenon and dad of two -- who celebrated his 39th birthday earlier this week -- backstage at the Summer Jam Concert last weekend (right).

Welcome to the good life!

The question is...

2:49 PM PT -- Sources connected to the family tell TMZ so far police have not told them about any direct threat Loibl made either on social media or otherwise. It appears, however that police know that the murder was premeditated because they say he left his home intending to carry out the killing.

Police have identified Christina Grimmie's murderer as Kevin James Loibl ... a 27-year-old man from St. Petersburg, FL.

Loibl drove from his home to Christina's concert Friday night in Orlando, and cops say he'd made plans to return to St. Pete after the show ... an indication he felt he could get away with the murder.

Police say they were searching Loibl's home ... no word yet on what they found there.

Loibl fatally shot himself during a struggle with Christina's brother ... after he shot the singer.

Loibl's family released a statement on the front door of their St. Petersburg home.

Christina Grimmie seemed happy and confident just minutes before a 27-year-old man gunned her down.