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Humanoid robots danced hip-hop, performed martial arts and played keyboard, guitar and drums at the opening ceremony of the first World Humanoid Robot Games in Beijing on Thursday evening.

The competition begins Friday with more than 500 humanoid robots in 280 teams from 16 countries, including the U.S., Germany and Japan, competing in sports including soccer, running and boxing. The event comes as China has stepped up efforts to develop humanoid robots powered by artificial intelligence.

During the opening ceremony, the robots demonstrated soccer and boxing among other sports, with some cheering and backflipping as if at a real sports event.

One robot soccer player scored a goal after a few tries, causing the robot goalkeeper to fall to the ground. Another player fell but stood up unassisted.

The robots also modeled fashionable hats and clothes alongside human models. In one mishap, a robot model fell and had to be carried off the stage by two human beings.

Teams from robot companies and Chinese universities including Tsinghua University and Peking University are competing in the games. Three middle schools are also participating.

China’s official newspaper People’s Daily quoted a government officer in Beijing as saying that every robot that participates “is creating history.”

The event will last three days, concluding on Sunday. Tickets sold to the public range from 180 yuan ($25) to 580 ($80).

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Olivia Zhang contributed to this report from Beijing.

OMAHA, Neb. (AP) — Berkshire Hathaway revealed four new investments Thursday in steelmaker Nucor, insurer UnitedHealth and two of the nation’s biggest homebuilders — Lennar and DR Horton — but it’s not clear if the investments are big enough to ensure that legendary investor Warren Buffett handled them.

Buffett, who plans to retire as CEO at the end of the year after six decades of building Berkshire, handles all of the conglomerate’s biggest investments worth $1 billion or more. Three of the new investments disclosed Thursday in a filing with the Securities and Exchange Commission are worth less than that, so they could be the ideas of one of Berkshire’s two other investment managers.

But Berkshire’s new UnitedHealth stake that was also revealed Thursday was worth $1.57 billion, so that one could be big enough to be Buffett’s handiwork. Berkshire got permission from the SEC to keep the other three investments confidential earlier this year while it built those stakes, but it apparently bought nearly 5 million UnitedHealth shares just in the second quarter. That stock jumped nearly 8% in aftermarket trading.

Berkshire’s filings simply offer a snapshot of its $258 billion portfolio at the end of the second quarters. Many investors comb through Berkshire’s filings every quarter because they like to follow Buffett’s moves. His record of trouncing the S&P 500 for decades has inspired legions of followers.

The filing doesn’t make clear who at Berkshire handled each investment. Besides Buffett, Ted Weschler and Todd Combs also pick stocks, but they generally handle smaller portfolios and Combs also serves as Geico’s CEO. But Buffett has had a hard time finding stocks or any other investments in recent years that he wants to invest much of Berkshire’s $344 billion cash in.

Berkshire’s Nucor stake of 6.6 million shares was the biggest new investment worth roughly $857 million at the end of the quarter. Shares of that company rose more than 6% in extended after-hours trading.

The Lennar investment was worth nearly $800 million. While the DR Horton stake was much smaller worth $191.5 million. Those companies’ stocks also saw gains in late trading

Buffett already knows quite a lot about the home building business because Berkshire owns the nation’s largest manufactured homebuilder, Clayton Homes.

Besides stocks, Berkshire owns dozens of companies in a variety of industries including Geico insurance, BNSF railroad, several major utilities and an assortment of manufacturing and retail companies. The Omaha, Nebraska-based company’s holdings include many well-known brands like See’s Candy and Dairy Queen.