A 23-year-old Taylor Swift fan died at the singer's Eras Tour concert in Rio de Janeiro Friday night, according to a statement from the show's organizers in Brazil. Swift announced Saturday on Instagram stories she would postpone her scheduled concerts until Monday due to extreme temperatures. Swift has two more shows in Rio on Saturday and Sunday.

While the cause of death for Ana Clara Benevides Machado has not been announced, media reported that fans were not allowed to take water into the stadium despite soaring temperatures, and the city's mayor has demanded changes before Swift's final two shows.

Swift posted in her Instagram stories after news of the fan's death writing she has "a shattered heart," and that she feels "overwhelmed with grief," when she even tries to talk about it.

"There's very little information I have other than the fact that she was so incredibly beautiful and far too young," the singer wrote.

The show's organizers, Time4Fun, said on Instagram that Benevides was attended by paramedics after feeling unwell. She was taken to the stadium's first aid center, then to a hospital, where she died an hour later, the statement read.

Several local media reported that water bottles were not allowed inside the Nilton Santos Olympic stadium, even though Rio and most of Brazil have had record-breaking temperatures this week, amid a dangerous and lasting heat wave, and fans were queuing for several hours in the sun.

Meteorologist Andrew Kozak told CBS News that this week Brazil had a heat index above 130°, making it deadly to be outside, even for a short period of time.

Justice Minister Flávio Dino said on X that the ministry will implement "emergency rules" regarding access to water at shows and other public events."

Online news site G1 reported that one of Benevides' friends, who attended the concert with her, said her friend passed out at the beginning of the concert, as Swift performed her second song, "Cruel Summer."

A photo of the two friends show them wearing Taylor Swift T-shirts inside the stadium.

"We always said that when (Taylor Swift) came to Brazil we would find a way to go. The ticket was very expensive, but we still found a way", she told G1 shortly after her friend's death.

Rio de Janeiro Mayor Eduardo Paes said on X the "loss of a young woman's life ... is unacceptable."

While authorities are investigating the circumstances of the death, Paes wrote, the municipality will demand Saturday that the show's production company provide new water distribution points, more brigades and ambulances and advance entrance to the show by one hour.

She wrote that this is the last thing she ever "thought would happen when we decided to bring this tour to Brazil."