A protester set their arm alight on court after breaching Laver Cup security at London's O2 Arena on the day of Roger Federer's final tennis match.

The incident occurred after the first set of the singles contest between Team Europe's Stefanos Tsitsipas and Team World's Diego Schwartzman.

The person who dashed onto the indoor court was wearing a white T-shirt that carried the message, "END UK PRIVATE JETS".

Another item on the court was also ablaze by the time security reached the person.

The protester put out the flames on their right arm, while a tournament official quickly smothered the fire on the court.

The End UK Private Jets campaign group said on its Twitter page: "Kai, 20, set their arm on fire at #LaverCup. The liveable climate of our planet is collapsing. No one is taking it seriously. Is humanity not worth saving? Let's get into resistance against this death machine."

Swiss great Federer was due in action later in the day in doubles, teaming up with Rafael Nadal for the last match of his career, as they took on Jack Sock and Frances Tiafoe.