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TikTok teenagers and K-Pop fans claimed responsibility for thousands of empty seats at President Donald Trump's first campaign rally in 3 months on Saturday night.

Trump is accustomed to speaking before packed arenas during his campaign rallies, but Saturday night's rally at the BOK Center in Tulsa, Oklahoma was barely half full. The BOK Center has a 19,000-seat capacity.

The half-empty arena almost looked like a Beyonce and Jay-Z concert tour.

Trump's campaign manager, Brad Parscale, had boasted on Twitter that the campaign received requests for more than 1 million tickets.

But reporters at the event on Saturday quickly noted the attendance was much lower than expected. Trump's campaign had events planned for the overflow crowd that was expected outside the arena. But the events were cancelled because there was no overflow crowd.

Within minutes after the rally ended, hundreds of teens took to TikTok to take responsibility for the embarrassing turnout.

The teenagers claimed they registered thousands of free tickets to the rally using their cellphones after @TeamTrump posted a tweet on June 11 asking supporters to register for free tickets.

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Fans of the Korean pop group BTS encouraged other teens to register for the rally -- and then not show up.

"It spread mostly through Alt TikTok — we kept it on the quiet side where people do pranks and a lot of activism," said YouTuber Elijah Daniel, 26. "K-pop Twitter and Alt TikTok have a good alliance where they spread information amongst each other very quickly. They all know the algorithms and how they can boost videos to get where they want."

Daniel said the teens deleted their posts so the news media wouldn't catch on to their plan and alert the Trump campaign.

"The majority of people who made them deleted them after the first day because we didn't want the Trump campaign to catch wind. These kids are smart and they thought of everything."

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South Korean boy band BTS urged fans to stay away from their upcoming shows to prevent the spread of the deadly coronavirus.

BTS is set to film several TV shows in Seoul this week, marking the release of their latest album, Map Of The Soul: 7, but they are encouraging their faithful fans not to show up to the show's tapings, WENN.com reported.

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In an email to fan club members, the bandmates have confirmed the shows will go ahead as planned, but without a studio audience.

"We have decided to fully co-operate with the government's policy to refrain from holding events with a massive number of participants in order to prevent the spread of coronavirus," a statement from the group's record label reads.

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"We would like to advise fans to refrain from visiting the venue of the press conference for your own safety, and ask you to support BTS by watching the press conference via livestreaming."

Drone videos show thousands of desperate South Koreans lining up to buy face masks after a few dozen cases of the coronavirus ballooned to over 800 confirmed cases practically overnight.

The coronavirus has claimed the lives of seven people in South Korea and over 800 people are infected in the country.

The Korean Music Awards, where BTS was nominated for Artist and Song of the Year, has also been canceled, WENN.com reports.