Prince William and Kate's convoy injuries elderly woman in crash

An elderly woman is in hospital

with serious injuries after she was struck by a police motorbike

escort for Britain's Prince William and his wife Kate.

The Duke and Duchess of Cambridge's convoy was travelling

from London to Windsor on Monday afternoon when the accident

occurred.

The woman, Irene Mayor, who is in her 80s, is in a serious

but stable condition, police said.

The Sun newspaper, citing witnesses, said the escort was on

the wrong side of the road clearing traffic for the couple's

convoy when the incident happened.

Britain's police watchdog, the Independent Office for Police

Conduct, said it was investigating.

The royal couple were "deeply concerned and saddened" to

hear of the accident, according to a spokeswoman, and a member

of their staff visited the woman and delivered flowers.

"Their Royal Highnesses have sent their very best regards to

Irene and her family and will stay in touch throughout every

stage of her recovery," the spokeswoman said.

The accident took place when the couple were on their way to

Windsor for the St George's Chapel service commemorating the

Order of the Garter.

In January, a woman was injured in a car crash involving

Prince Philip near the royal family's Sandringham Estate.

The Land Rover that Philip was driving flipped over. The

98-year-old was uninjured and voluntarily surrendered his

driver's license soon after.

Reuters