The mayor of Seattle, Ed Murray, has said the gay rights movement has often seen a violent reaction to its moments of progress.

"For too long, our community has been the target of violence throughout the world," he said.

The BBC's Jessica Lussenhop has been looking at how the Orlando attack is a reminder of the violent struggle LGBT people have faced.

Among the people attending a vigil in Seattle on Sunday was Zuleyha Ozonder. 

She is a Muslim, and, using the expression that has come to be so familiar in the wake of attacks by religious extremists, carried a sign saying that the Orlando killings were "Not in my name".

Image source, AP

Two more victims have been officially named. They are Eddie Jamoldroy Justice, 30, and 29-year-old Darryl Roman Burt 

Eddie Jamoldroy Justice had been hiding in a bathroom at the club while Omar Mateen was roaming outside with a gun. He sent several texts to his mother, telling her what was going on and asking her to call the police.

One of his texts said: "He's coming. I'm gonna die."

Speaking to the media in Boulder, Colorado earlier, Omar Mateen's ex-wife Sitora Yusufiy described him as a mentally unstable man, with a violent temper and history of steroid abuse, but with no sign of religious extremism.

She said her family had "literally rescued" her from her home. "They had to pull me out of his arms and find an emergency flight." They divorced in 2011. 

Image source, AP

JK Rowling, author of the Harry Potter books and a well-known supporter of LGBT rights, has said one of the victims worked at the Harry Potter ride at Universal Studious.

Omar Mateen used an assault rifle in his attack on the club. It was a similar type to that used by Adam Lanza in 2012, when he walked into a school in Sandy Hook, Connecticut and killed 28 people, mostly very young children.

Parents in Sandy Hook are currently trying to sue the manufacturers of the AR-15 gun that killed their children. Their lawyer said on Sunday that the gun has become the gold standard for mass murder of innocent civilians".  

He said the gun companies "continue to sell it to civilians, abandoning reason in exchange for profit," he said. 

London is hosting its annual Pride march next weekend, one of the world's largest gay parades. Organisers have said they will hold a minute's reflection during the event. , external

"The horrific events in Orlando highlight that the campaign for respect and equality must go on within communities across the globe," said Pride's chair, Michael Salter-Church. 

Pride in London Director Mohsin Zaidi said the march would "be our moment to stand tall in the face of such brutality".

The owner of another gay nightclub in Orlando has said gunman Omar Mateen tried to contact him on Facebook last week, the East Orlando Post reports. , external

Micah Bass said he believed his club could have been a target, if it had not been closed this weekend. 

The paper quotes former Orlando law enforcement officer James Copenhaver as saying it suggests Mateen could have been "gathering intel" on which club to attack. 

Local newspaper the Orlando Sentinel has published a powerful editorial, external on the killings, saying the city "now tragically sits atop a list of infamy".

"We will not - we must not - let Sunday’s heinous act of brutality and cowardice define our community," it says.

"Let our community define itself by our unequivocal response: United."  

It's about 01:00 in Orlando so little news is emerging, but on the other side of the US, vigils are continuing. Here are some images from California. 

Image source, Reuters

Image source, AFP

Image source, EPA

Eyewitnesses have spoken of scenes of panic and chaos, when the gunman walked into Pulse and opened fire. 

"It's like you were at a gun range, and all you hear is just 'boom' and 'bang, bang'," said Christopher Hansen.

Jackie Smith told Associated Press: "Some guy walked in and started shooting everybody. He had an automatic rifle, so nobody stood a chance."

If you're just waking up in Europe, this is our live coverage of the shooting at the Pulse nightclub in Orlando, Florida. Fifty people died in the club, a popular gay venue, making it the worst mass shooting in recent US history.

The gunman was a US civilian, Omar Mateen. He appears to have acted alone, though the so-called Islamic State has claimed he was a "fighter" for it. He was shot dead in the club by police.

Eight people have been officially named as victims so far, external - all of them people in their 20s and 30s who were out celebrating a Saturday night with friends and partners. There are dozens of people injured. 

Across the US, people are holding vigils to remember those who died, while questions are again being asked about why the US appears unable to stop attacks like this. 

How the attack unfolded

Image source, Reuters

New York's iconic Empire State Building has gone dark as a mark of respect to the victims of the attack. New York Mayor Bill de Blasio said security would be strengthened, especially at locations associated with the LGBT community. He added that there were no credible threats directed at New York City.

Image source, AFP/Getty Images

President Obama has said there is as yet no "definitive judgement on the precise motivations of the killing" but that it is appropriately being invested by the FBI as an act of terrorism.

But he says it's clear the gunman was "a person filled with hatred".

You can watch his full speech here. 

More details are emerging from the imam of the mosque that gunman Omar Mateen used to attend.

"When somebody would shake hands with him he would smile and shake hands with them and he would leave," Syed Shafeeq Rahman told Reuters. 

"And he would bring the five-year-old son with him and the son would be playing around him and he would be busy with his prayer and then he would take his son on his shoulders and he would just leave."

He said Mateen had never discussed homosexuality with him. 

Who was gunman Omar Mateen?

Image source, Reuters

Speaking to the BBC in 2015, Mr Obama said failing to pass "common sense" gun safety laws was the greatest frustration of his presidency.

"If you look at the number of Americans killed since 9/11 by terrorism, it's less than 100. If you look at the number that have been killed by gun violence, it's in the tens of thousands." 

The BBC's North America correspondent Anthony Zurcher explained in 2015 why Mr Obama had found it almost impossible to convince America that its gun laws needed to change. 

He wrote that almost 80% of respondents to a Pew Research survey in mid-2015 "backed laws preventing the mentally ill from purchasing firearms, and 70% were in favour of a national gun-sale database."

But he added: "Those numbers don't really mean much, however. What does matter is the opinion of members of the US Congress - and that legislative body is overwhelmingly against further gun regulation."

President Obama has described the Orlando attack as "an act of terror and an act of hate", and has yet again said the US must make it harder for people to acquire lethal weapons. 

"We have to decide if that's the kind of country we want to be. To actively do nothing is a decision as well."  

You can read our latest story on the attack here.

If you're just joining, this is our live coverage of the aftermath of the shooting at a gay club in Orlando, Florida. With 50 people dead, it is the worst mass shooting in recent US history.

And the list of mass shootings is long. President Barack Obama has had to give statements to the country at least 15 times, remembering the victims and urging greater gun control. 

Here's what he has said after some previous attacks.

In October 2015, after a shooting at a community college in Oregon killed nine people, Mr Obama said: "The reporting is routine, my response here at this podium ends up being routine, the conversation in the aftermath of it. We've become numb to this."