WASHINGTON, July 8 (AFP) - George Floyd said he could not breathe more than 20 times, called out for his children and late mother and said officers would "kill" him before he died in Minneapolis police custody, new evidence showed.

Floyd, a black man, died on May 25 when a white police officer knelt on his neck for nearly nine minutes. His death has unleashed a massive wave of protests against systemic racism and police brutality in the United States and inspired demonstrations across the world.

Video of his death went viral and showed Floyd shouting "I can't breathe" and calling for his mother as he suffocated.

But transcripts of the police officers' body camera footage, filed Tuesday in Minnesota state court by Thomas Lane, one of the officers involved in Floyd's death, has revealed new details about his final moments.

When the officers first arrested him, Floyd begged them not to put him in the police car, telling them he was claustrophobic and in physical distress.

As they tried to force him into the car, Floyd cried out that he could not breathe and was "going to die in here".

Later, according to the transcript, he said, "Momma, I love you. Tell my kids I love them. I'm dead." He called for his mother and children several more times.

Throughout his arrest, Floyd said "I can't breathe" more than 20 times. The officers can be heard telling him to "relax", and that he was doing "fine" and "talking fine".

At one point, as Floyd insisted they were going to kill him, officer Derek Chauvin shouted, "Then stop talking, stop yelling, it takes a heck of a lot of oxygen to talk."