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The singer had been chatting to mum Katherine until 3am the night before the attacks, which led him to oversleep and miss an appointment.

MJ’s brother, Jermaine Jackson, said in the autobiography Through a Brother’s Eyes: “Thankfully, none of us had had a clue that Michael was due at a meeting that morning at the top of one of the Twin Towers.

“We only discovered this when Mother phoned his hotel to make sure he was okay.

“She, Rebbie, and a few others had left him there around 3 am. 'Mother, I’m okay, thanks to you.’

“He told her ‘you kept me up talking so late that I overslept and missed my appointment'.”

There were 2,753 victims at the World Trade Center on September 11, 2001.

The King of Pop was would have been 43 at the time.

The revelations come as an explosive documentary Leaving Neverland was screened at the Sundance Film Festival – which looks at new child abuse allegations.

(Image: GETTY)

(Image: GETTY) (Image: GETTY)

Leaving Neverland will air on television in sing and features the singer’s former boy companions Wade Robson and James Safechuck who both say Michael sexual abused them over several years.

The doc premiered last month where Robson and Safechuck got a standing ovation afterwards.

Both had previously told police that MJ did not molest them with Robson testifying in the 2005 trial in which the singer was acquitted of molesting another boy.

(Image: GETTY)

Robson and Safechuck filed lawsuits that were dismissed and are currently on appeal.

Michael Jackson denied all allegation of sexual abuse made against him.

His estate called the documentary "an outrageous and pathetic attempt to exploit and cash in".