Roslyn Corrigan, president George HW Bush and Sari Young at the November 2003 event - Courtesy Corrigan Family/Time

A sixth woman has claimed she was groped by George HW Bush, describing an incident when she was just 16 years old.

The former US president has already apologised after numerous reports that he inappropriately touched women while posing for photographs with them at public events.

Roslyn Corrigan said she posed for a photo with Mr Bush in 2003 at a gathering of CIA officers in Texas. She was just 16 years old at the time and attended the event with her mother and father, who was an intelligence analyst.

But while she stood for the picture with Mr Bush and her mother, the former president squeezed her bottom, Ms Corrigan told Time Magazine.

"He dropped his hands from my waist down to my buttocks and gave it a nice, ripe squeeze, which would account for the fact that in the photograph my mouth is hanging wide open,” she said.

Heather Lind, 34, claimed Mr Bush, 93, assaulted her four years ago while they posed for a photograph alongside the former president's wife

“My initial action was absolute horror. I was really, really confused. The first thing I did was look at my mum and, while he was still standing there, I didn’t say anything. What does a teenager say to the ex-president of the United States?”

The magazine said it had spoken with seven people who had been told about the encounter by Ms Corrigan.

She is the sixth woman to accuse the 41st US president of touching them during photo calls. Actresses Heather Lind and Jordana Grolnick, author Christina Baker Kline, journalist Liz Allen and former politician Amanda Staples have all accused Mr Bush of similar incidents.

Three of the women claimed Mr Bush jokingly told them his favourite book was "David Cop-a-feel".

Christina Baker Kline, a British-born novelist, claims Mr Bush put his arm around her as they posed for a photograph before dropping his hand to squeeze her "butt"

When the allegations emerged Jim McGrath, a spokesman for Mr Bush, said the former president apologised to "anyone he may have offended" but blamed his wheelchair for the impropriety.

“At age 93, President Bush has been confined to a wheelchair for roughly five years, so his arm falls on the lower waist of people with whom he takes pictures,” said Mr McGrath.

“To try to put people at ease, the president routinely tells the same joke — and on occasion, he has patted women’s rears in what he intended to be a good-natured manner."

But Ms Corrigan said the explanation had prompted her to speak out about her experience in 2003 — when Mr Bush was 79 years old and not using a wheelchair.