Police are investigating an alleged spiking in a bar on the Westminster parliamentary estate.

A woman, believed to be a parliamentary researcher, told police and staff at parliament’s Strangers’ Bar that her drink had been spiked, according to Politico.

The incident is understood to have taken place at the Palace of Westminster on 7 January at about 6.30pm.

A spokesperson for the UK parliament said: “We are aware of an incident which took place on the parliamentary estate in early January, which was reported to parliamentary security and is now being investigated by the Metropolitan police service.”

The woman who made the allegation is being supported by UK parliament, the Guardian understands.

The FDA union, which represents civil servants and public sector professionals, said the alleged incident was “deeply concerning” and urged parliamentary authorities to “assess the risks and take immediate action to prevent this happening again”.

Mike Clancy, the general secretary of Prospect trade union, said: “This is a very concerning alleged incident, especially given the long history of allegations about behaviour in parliament.

“We will be seeking more information about this case and will continue to work to ensure parliamentary staff can feel safe in their workplace.”

In November 2023, the head of parliament’s complaints watchdog said she did not know whether the Palace of Westminster was a safe workplace for women.

Walton told the House Magazine: “‘I don’t know’ is the honest answer. I wouldn’t say that nobody feels safe, but I have heard lots of things where women don’t from some of the engagement that I’ve done.”

A Metropolitan Police spokesperson said: “Police received reports of an alleged spiking at an establishment in the House of Commons, on Tuesday, 7 January, at around 6.30pm.

“The investigation is ongoing and the victim is being supported by officers. There have been no arrests at this stage.

“We would encourage anyone who believes they have been a victim or witness to spiking, in any form, to contact us on 101, or 999 in emergency.

“Alternatively, you can contact the independent charity Crimestoppers anonymously on 0800 555 111.”