"Are you all ok?" she was quoted as saying by BBC. "People were fainting and getting pulled out. It's hot, I know".

Fans said they were 'squished', forcing the singer to briefly stop her show.

She halted her show until the pressure in front of the stage eased.

"Take a step back, give everybody some space," Eilish said. "If someone looks a little woozy, just tell someone."

She added: "Don't try to save feelings."

She had even asked the O2 authorities to distribute water to the audience.