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Shocking new evidence of serious assaults on women at Westminster can be revealed by the Evening Standard today.

A woman victim has told how the Conservative MP she worked for sexually assaulted her in her office at the House of Commons, approaching her from behind and grabbing at her crotch.

She later told the Commons authorities what had happened - but they said there was “nothing they could do”.

In a second shocking case, a former Conservative Party aide reveals that she went to police after her drink was “spiked” with a suspected date rape drug in Strangers’ Bar at the House of Commons, a drinking den reserved for MPs and their guests.

A police officer told her it was “not the first time” that allegations of drinks being spiked had been made at the Commons.

The horrifying incidents are among the most serious yet to emerge from the ballooning scandal of sexual harassment, intimidation and assaults at Westminster.

Theresa May’s own deputy, First Secretary of State Damian Green, was fighting for his political life after being accused of making advances on a writer 30 years his junior.

He denied the allegation made by family friend Kate Maltby but came under fire from angry women MPs. “In normal circumstances that person would be suspended,” claimed former Tory minister Anna Soubry.

The new victims who spoke to the Evening Standard are not being named for legal reasons.

The sexual assault victim was on the staff of an MP. It happened four years ago when she was working in his office and the politician approached her from behind and put his hand up her skirt.

She said: “He had made comments previously which made me feel a bit uncomfortable but I never felt physically threatened.

“I was on my own in the office with him late one afternoon, which was not unusual, when out of nowhere he just put his hand between my legs.

“I was totally shocked. I just froze. It was over in seconds and I just ran out of the room. It was never mentioned.”

She later started working for another MP and felt emboldened to report the assault to the Commons authorities. “They were very nice but they essentially told me I had to talk to the party or to the police, there wasn’t anything they could do.”

The woman whose drink was spiked said it happened in March when she spent the early evening with old friends at the Strangers’ Bar, which is known to locals as The Kremlin because it was traditionally a late-night haunt of Labour MPs.

She had a couple of drinks but blanked out after her companions left and was unable to remember anything from 8.30pm.

“I got home but I have no idea how,” said the woman. “I only know I must have taken a taxi because there was a receipt in my pocket.”

She had a “rage-like” episode in the early hours but felt clear-headed in the morning but had no recall of the night. “My husband just looked at me and said ‘what on earth happened to you?’”

Realising that she might have been drugged, she told the local police and was advised to get a blood test. Hospital tests later that morning found no trace of the drug left in her system.

However, when she described what had happed to a doctor, she told her that her account matched the experiences of victims of date rape drugs, saying that such drugs soon break down in the human body.

The victim later spoke to police in central London and was told by an officer: “This is not the first incident of its kind at Westminster.”

Police investigators pulled CCTV footage from cameras at the Commons. There were no cameras in the Strangers’ Bar, to protect the privacy of MPs, but they found footage of the victim swaying and crashing into walls as she made her way out of the Palace of Westminster “looking incredibly vulnerable” but ignored by officials and officers.

The woman said she no longer accepts drinks unless she sees them poured in front of her eyes.

A House of Commons spokesman said: “Allegations of criminal activity on the Parliamentary Estate are a matter for the police. Any police investigation carried out as a result of such allegations would have Parliament’s full cooperation.”