A woman was arrested by police, who sent a riot van to her door at dawn, after she posted about her ex-partner, a serving Metropolitan police officer, on Facebook.

Sarah* had been alerted by a friend to a post about her former partner that had been made in a local Facebook group linked to “Are we dating the same guy?”. The group is part of a global network of similar Facebook pages used by women to seek information about their partners, and warn others of “red flags” from men they have dated.

Sarah commented on the original post, saying she and her ex-boyfriend were together for almost five years, “and then he cheated on me and gaslit me saying I was wrong”.

She then made her own post in the group, warning other women about her ex-partner. “I was basically just saying that I just want to warn other women,” she said.

Through the group, she said, she found out more information about her ex-partner’s behaviour while they were together, and sent him two messages. In one she called him a “pussy”, and then blocked his number.

“I messaged him and just basically said, the audacity of you to blame me for the breakdown of our relationship,” she said.

“I thought nothing of it until 13 May, when I got a knock on my door, well, banging on my door, at 4.45 in the morning.”

Sarah opened the door to three police officers, who told her they were there to arrest her for alleged harassment. “I knew instantly that it was him,” she said.

“They took me in, they took my phone, they took my computer, they put me in the back of a van,” she added.

She spent about 12 hours in custody, where she was questioned about the messages and Facebook posts.

During questioning, Sarah said, she did not dispute any of the evidence police officers put before her.

“I’ve got nothing to hide. I’m not ashamed of what I’ve done. I’m doing it to protect women, and if I can just save one woman going through what I’ve gone through, then I’ve done something,” she said.

She said police asked her if it was true she had called her ex “a pussy”. “I was like, yeah, you can’t arrest me for calling someone a pussy, that’s ridiculous.”

After questioning, she was released without charge. The duty solicitor, Sarah said, told her that in his opinion, “this wouldn’t have happened if [her ex] wasn’t a police officer”.

After her release, a police officer came to Sarah’s house and served her with civil court papers, with her ex-partner seeking a non-molestation order.

The court rejected his application, expressing concern about “the applicant’s abuse of power in respect of the respondent being arrested at 4.45am by three police officers and a riot van attending the respondent’s property, [and] the applicant’s request for a detective to personally serve the respondent”.

Dismissing his application, court papers said it “related to one Facebook post on 6 May 2024 and no other allegations had been raised by the applicant in support of a non-molestation order”.

Sarah made a formal complaint, claiming her former partner had abused his position as a police officer by seeking her arrest, but this was rejected after nine months.

As part of the investigation, her ex-partner said he had reported her behaviour because she posted details of the police station he worked at.

In a letter, an inspector told Sarah that “the service provided [was] acceptable”, and “I do not consider unsatisfactory performance procedures are appropriate in respect of any officers.”

“Financially, if I had all the money in the world, I would push and push and push to take this further with lawyers behind our backs,” Sarah said. “But unfortunately, we don’t have the financing to do that.”

She said the experience had “changed her whole life”, and that she sometimes had panic attacks when she saw police officers in the street.

“I’m struggling to go out and just enjoy myself for the fear that he’s going to be there and he’s going to think that I’m following him,” she added.

A Metropolitan police spokesperson said: “In May 2024 officers arrested a 39-year-old woman on suspicion of harassment. After an interview under caution, she was released without further action.

“Subsequently, allegations were made relating to an abuse of power by a serving Met officer. These were formally investigated and found to be unsubstantiated.

“The action taken in this case was considered to be necessary, proportionate and compliant with the Police and Criminal Evidence Act as officers need to conduct prompt and effective investigations.”

*Name has been changed.