Legal action has begun following rapper Travis Scott's show at the Astroworld Festival in Houston which left eight people dead and many others injured.
Billboard reports concertgoer Manuel Souza has filed a petition in the Harris County District Court over the deadly incident on Friday night, saying there was both the "encouragement of violence" and "a motivation for profit at the expense of concertgoers' health and safety".
Investigations into the injuries and deaths, and the lead-up to them, are still ongoing. However, this is not the first time Travis Scott has been in trouble with authorities over dangerous activity at his shows.
Here's what we know so far about the victims and what led to the disaster.
What do investigators think happened at Astroworld?
At this stage, it's all still under investigation, but authorities are exploring the possibility of a dangerous crowd surge during Scott's set.
Footage has been posted to social media showing fans screaming at staff to stop the show.
There have also been allegations of needle spiking — people in the crowd being pricked with needles — but it's not yet clear whether the people who died had been injected with any substance.
Police have confirmed that a security guard felt a prick while he was attempting to restrain someone at the event, causing him to fall unconscious. He was treated with a drug usually used to counteract opioid overdoses.
What has Travis Scott said about it?
A clearly emotional Scott posted a video message to Instagram on Sunday, saying his team was trying to get in contact with the families of the victims.
"I just want to send out prayers to the ones that was (sic) lost last night," he says.
"You know my fans … really mean the world to me and I always just really want to leave them with a positive experience.
"Anytime I can make out anything that's going on, I stop the show and help them get the help they need.
Scott said he and his team were working with local authorities, including the police and fire department, to "help us figure this out" and he asked anyone with information to come forward.
"I mean, I'm honestly just devastated," he said.
"I could never imagine anything like this happening. I'm going to do everything I can to keep you guys updated and keep you guys informed on what's going on."
His partner Kylie Jenner, who was there on the night of the incident, posted a message to her own Instagram account, saying she and Scott were "broken and devastated".
"My thoughts and prayers are with all who lost their lives, were injured or affected in anyway (sic) by yesterday's events. And also for Travis who I know cares deeply for his fans and the Houston community," she posted on Sunday.
"I am sending my deepest condolences to all the families during this difficult time and will be praying for the healing of everyone who has been impacted."
Has anything like this happened at a Travis Scott show in the past?
Not to this extent, but it's not the first time people have gotten hurt during one of Scott's shows, and the rapper has a history of encouraging fans to engage in dangerous behaviour.
His Netflix documentary, Look Mom I Can Fly, shows people being hauled from crowds at his shows by security staff and paramedics.
It also features a scene where Scott runs from the stage in Arkansas when he realises police are at the venue. He was arrested and eventually pleaded guilty to disorderly conduct for inciting a riot at the concert.
Local police say he encouraged people to rush the stage.
"I feel bad though. I heard about kids getting hurt and shit," he says in the documentary after being released from the local police station.
He was arrested and charged over a similar incident at Lollapalooza in 2015, with police accusing him of urging fans to jump over security barricades.
The documentary, and a lot of his other media appearances, are heavy on highlight reels showing him launching into the crowd (often feet first), people crowd-surfing, crowd crushes and mosh pits.
One man was left paralysed after falling from a balcony during a Travis Scott show in 2017.
Footage from the crowd showed Scott encouraging a different fan to jump from a lower balcony, saying "they're going to catch you," but Kyle Green alleged he was forced over the third-floor platform and broke several bones.
Mr Green released a statement to Rolling Stone via his lawyer, saying he was "devastated and heartbroken" for the victims and families affected by the Astroworld incident.
"He’s even more incensed by the fact that it could have been avoided had Travis learned his lesson in the past and changed his attitude about inciting people to behave in such a reckless manner," Mr Green's lawyer, Howard Hershenhorn, said.
What do we know about the victims?
Authorities have not yet confirmed the details of all the victims, but family and friends have revealed some details on social media.
Illinois man Julio Patino was away on a business trip when he got the call that his 21-year-old son Franco Patino had died at the event. Mr Patino said concerts should be more tightly controlled.
"If they don't know how to do that, they should have cancelled the concert right then when they noticed there was an overcrowd," he said.
"They should not wait until they see people laying down on the floor, lifeless."
Family and friends of 16-year-old Brianna Rodriguez have launched a GoFundMe page to help pay for her funeral, with the campaign so far raising over $US40,000 ($54,145).
"Brianna was one of the victims from the Astroworld event," the page says. "Dancing was her passion and now she’s dancing her way to heaven's pearly gates."
The Houston Chronicle reports that the youngest victim was John Hilgert, a 14-year-old high school student and baseball player.
What happens from here?
Investigations are ongoing, and Scott has said on his Instagram story he's cooperating with authorities as they try to work out what happened.
Part of the investigation will include a review of the way the stage and barriers were designed and how that might have impacted crowd safety.
Meanwhile, a memorial has been set up at NRG Park, with people bringing candles, flowers and cards to pay tribute to those who lost their lives.
Rapper Roddy Ricch, who also performed at the Houston show, said on social media he would donate his income from the event to the families of those who died.
What is a crowd surge?
Crowd surges aren't uncommon at festivals or large events. They usually involve a large mass of people pushing towards a stage, which for people towards the front and in the middle can result in crushing pressure that can make it difficult to move and breathe.
A crowd crush during a Limp Bizkit set at Sydney's Big Day Out in 2001 killed 16-year-old Jessica Michalik. A coronial inquest didn't find anyone negligent, but a coroner did say crowd-control measures were reactive rather than proactive.
In 2016, more than 70 people were injured in a massive crowd crush at Falls Festival in Lorne. They ended up sharing in an almost $7 million payout following a settlement approval from the Victorian Supreme Court.
That incident occurred while people were trying to rush between stages — punters at the time told Hack that people "were covered in blood" and they were "seriously fearing for our lives".
One of the victims, who was 22 at the time, was left with a fractured sacrum and two black eyes. She said she was "screaming until I couldn’t anymore because the air was crushed out of my lungs".
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