Pop star ‘devastated’ by death of woman, named in media as Ana Clara Benevides, 23, who reportedly fainted and had cardiac arrest.

In a statement on Instagram, the pop star said her heart was "shattered", adding: "She was so incredibly beautiful and far too young."

It came as temperatures soared in the city, which is the latest stop on Swift's record-breaking Eras Tour.

The star was seen handing out water bottles to fans during the concert.

"I can't believe I'm writing these words but it is with a shattered heart that I say we lost a fan earlier tonight before my show," Swift wrote.

"I can't even tell you how devastated I am by this."

Swift said she would not be able to speak about the incident from stage because she felt "overwhelmed by grief" whenever she tried to talk about it.

"I want to say now I feel this loss deeply and my broken heart goes out to her family and friends."

She added that this was "the last thing" she thought would happen when she brought the tour to Brazil.

Swift said she had little other information about the death.

However, according to Brazilian newspaper Fohla De Sao Paolo, the fan fainted at the stadium and later died, with the cause of death being given as cardiorespiratory arrest.

In videos and pictures circulated on social media, Swift was later seen urging staff at the stadium to give water to fans during the concert.

At one point, while singing All Too Well, she was seen throwing a water bottle into the crowd.

Swift's Instagram story, commenting on the death of the fan, was posted after the show.