Lorde was forced to halt her headline performance at Lollapalooza after multiple fans reportedly lost consciousness in the crowd during Chicago’s scorching heatwave.
The Royals singer, 29, was headlining the iconic music festival in Grant Park when soaring temperatures prompted several medical emergencies among concertgoers packed near the front of the stage.
According to NBC Chicago, the New Zealand star paused her set on at least three occasions to ensure security and medics could reach fans who had reportedly passed out.
Witnesses said Lorde repeatedly called for assistance after spotting people in distress in the audience, temporarily bringing the show to a standstill while help made its way through the crowd.
The incidents came as temperatures climbed to around 90F (32C), with the city experiencing intense summer heat.
The singer, whose full name is Ella Marija Lani Yelich-O’Connor, acknowledged the conditions as she took to the stage, telling the audience: ‘You look hot from up here.’
Once those requiring medical attention had been helped, Lorde resumed the performance, treating fans to a setlist packed with some of her biggest hits, including Royals, Green Light, Supercut and Ribs.
She also delighted the crowd with a surprise appearance from fellow pop star Charli XCX, who joined her on stage for a performance of their fan-favourite collaboration Girl, So Confusing.
The set marked a full-circle moment for Lorde.
Although she first performed at Lollapalooza back in 2014, her planned headline appearance in 2017 was cut short when torrential rain forced organisers to evacuate the festival before she could finish her set.
Reflecting on finally getting to complete the milestone, she told the crowd: ‘Let’s complete the circle from 2017 to 2014 to right now.’
Lorde has been touring in support of her fourth studio album, Virgin, which was released last summer.
The incident comes amid growing concerns about extreme weather at outdoor music festivals, with organisers increasingly forced to contend with both dangerous heat and severe storms during the busy summer season.