NEW YORK (AP) — The U.S. Open semifinal between Coco Gauff and Karolina Muchova was delayed by 50 minutes because of a disruption by environmental activists in the Arthur Ashe Stadium stands on Thursday night. One protester glued his bare feet to the concrete floor.

Gauff was ahead 6-4, 1-0 when play was halted early in the second set.

Security guards and, later, more than a half-dozen police officers went over to confront the three protesters, who were wearing shirts that read, “End Fossil Fuels.” Two of the activists were escorted out within several minutes, but it took longer to remove the person who stuck his feet to the ground.

Spectators were asked to move away to clear a path for the police, who were cheered by fans sitting near the section where the disruption happened.

One of the protesters, who identified himself only as Ian, said they wanted the U.S. Open to be accountable because it has sponsors who are large corporations whose policies are contributing to global warming.

“We are not trying to harm the athletes in any way. We have nothing against the sport, but we are really trying to draw attention to an issue here that there will be no tennis left for anybody in the world to enjoy,” he said.

Gauff sat on her sideline bench for a bit during the break in the match, eating fruit out of a plastic container, before then getting some tennis balls and hitting a few practice serves. Muchova was briefly visited by a trainer during the interruption.

Later, both players headed toward the locker room as the delay continued. Gauff sat on a treadmill, a towel draped over her lap, while chatting with members of her team.

It is the latest in a recent series of protests at sporting events — and tennis, in particular — related to the use of fossil fuels.

At Wimbledon in July, two matches were interrupted when environmental activists jumped out of the stands at Court 18 and scattered orange confetti on the grass.

At a U.S. Open tune-up tournament in Washington last month, about a dozen people were asked to leave the site after chanting and displaying signs protesting the use of fossil fuels.

Gauff, a 19-year-old American, and Muchova, a 27-year-old from the Czech Republic, were both playing in the semifinals at Flushing Meadows for the first time.

Their match was the first of the evening. The other women’s semifinal, between Aryna Sabalenka of Belarus and Madison Keys of the United States, was scheduled to begin after Gauff vs. Muchova finished.

The two winners Thursday will play each other for the women’s singles championship in Ashe on Saturday.

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