Monday morning in the United Kingdom a woman of 83 was knocked down by a police motorbike that was escorting Prince William and Kate. It has been reported that the woman is in serious but stable in hospital.

Witnesses said the bike was on the wrong side of the road clearing traffic when it hit Irene Mayor in East Sheen, West London.

Irene Mayor, 83, was thrown into the air by the impact and landed awkwardly.

She was taken to hospital by air ambulance and was on Tuesday night serious but stable with a broken pelvis and other injuries.

Scotland Yard told NBC News that a police motorcycle was "involved in a collision with a pedestrian. The woman, believed to be in her 80s, has been taken to hospital for treatment where she remains."

Fiona, who lives with her mum 300 yards from the accident scene in East Sheen, West London, told The Sun: “She’s got lots of injuries. They are just keeping her stable at the moment.”

A spokesperson for the royal couple said Prince William and the duchess did not see the accident. The two royals, who learned of the accident after they got to Windsor Castle, are reportedly very upset and hoping to keep in touch with the woman.

"The Duke and Duchess of Cambridge were deeply concerned and saddened to hear about the accident on Monday afternoon," a palace spokesperson said. "Their Royal Highnesses have sent their very best wishes to Irene and her family and will stay in touch throughout every step of her recovery."

A member of the couple’s staff has visited the woman and delivered flowers.

Prince William and Kate attended the Order of the Garter ceremony in Windsor Castle on the day of the accident. They followed up that event with an appearance at day one of Royal Ascot on Tuesday.