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A woman has told how she was allegedly sexually assaulted by an MP who pinned her down on a hotel bed during a foreign trip.

She said she was forced to flee his room as "shock turned to fear" - yet despite raising the attack with four authorities, she says all failed to act.

The story is one of the most shocking so far to emerge of alleged sexual impropriety by MPs and senior aides in Westminster.

It comes after a widely-circulated dossier named dozens of Tory MPs accused of a range of behaviour, both consensual and non-consensual.

Labour activist Bex Bailey has also tonight said she was raped aged 19 but told by a senior colleague not to report it.

The woman who made the latest allegation spoke to the Guardian and ITV. She asked to remain anonymous and her alleged attacker is not named.

(Image: Carl Court)

She said she was about to finish a trip to Europe when the MP asked her to come upstairs with him and "come and talk to me while I pack my bag".

At first she thought nothing of it, the woman said, until she was in the room and the MP said: "Come and sit on the bed."

She told The Guardian: "He basically pulled me on to the bed and pushed me back, and tried to kiss me.

"I very clearly said: ‘No, this is not what I want.’

"He held me by my shoulders and pushed me back again.

"On the third time, I managed to push him off again and basically ran out the room."

She told ITV: "The shock soon turned into fear.

(Image: @bexbailey/Twitter)

"I realised I was in quite a vulnerable situation, being in a foreign country, nobody knew where I was, and with someone a lot bigger and stronger than me."

The woman said she complained to the MP's party, police, the parliamentary standards commissioner and the Commons authorities.

She said only police took her allegations seriously but could not take it further because the incident happened in a foreign country.

She said she was told the parliamentary commissioner could not investigate because she was employed by another MP, not the House of Commons itself.

Activists have repeatedly called for a change in the rules to allow a "proper HR" service for workers in parliament.

The woman told ITV: "Initially I couldn't believe it. I was horrified. I mean I've never worked in an institution which made me just feel so isolated.”

“The manifestation of the kind of, the power, that that person had over me was quite overwhelming.

(Image: Carl Court)

“You know, a physical power but also, a more...the power dynamic is such that you know, he, it is really hard to challenge and call out that kind of behaviour. And that's one of the scary things.”

It comes as a list of dozens of Tory MPs accused of harassment, inappropriate behaviour or inter-office relationships or affairs circulated widely in Westminster today.

Defence Secretary Michael Fallon apologised for putting his hand on a journalist's leg at a dinner 15 years ago.

Downing Street refused to say if Theresa May had full confidence in Sir Michael - but stressed the Prime Minister thought it right he apologised.

Commons leader Andrea Leadsomsaid ministers who make staff feel uncomfortable face being sacked and "Parliament must take action in days, not weeks."