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The Crown Prosecution Service is now reviewing a decision to drop charges against a Goldsmiths diversity officer who allegedly tweeted #killallwhitemen.

Police confirmed on Tuesday that the case of Bahar Mustafa, who sparked a row earlier this year when she asked white people and men not to attend a diversity event, had been discontinued.

But just hours later the CPS said it would be conducting a review into the decision following a request from a complainant.

A CPS spokesperson said: “Following the decision to discontinue this case, one of the complainants has now requested a review of this decision under the Victim’s Right to Review Scheme.

"It would not be appropriate to comment further on this case until this process has been completed.”

Ms Mustafa, 28, from Edmonton, was handed a court summons last month over allegedly offensive comments.

The claims came amid a row caused by remarks Ms Mustafa, the welfare and diversity officer at Goldsmiths University students' union, shared on Facebook.

In a post promoting an event to diversify the curriculum, she allegedly wrote: "Invite loads of BME Women and non-binary people!! Also, if you’ve been invited and you’re a man and/or white PLEASE DON’T COME just cos I invited a bunch of people and hope you will be responsible enough to respect this is a BME Women and non-binary event only.”

She was later accused by critics of using the hashtag #killallwhitemen in posts on Twitter. Her comments also led to the launch of an online petition, signed by nearly 27,000 people, to have her ousted from her role.

But Ms Mustafa defended her position at the time by saying that minority women could not be racist.

In a statement read out to fellow students, she said: "There have been charges laid against me that I am racist and sexist towards white men.

"I, an ethnic minority woman, cannot be racist or sexist towards white men, because racism and sexism describe structures of privilege based on race and gender.

"Therefore, women of colour and minority genders cannot be racist or sexist, since we do not stand to benefit from such a system.”

In October she was handed a court summons to answer two charges.

The first accused her of sending a letter, communication or article conveying a threatening message between November 10, 2014, and May 31, 2015.

The second said she was charged with sending by public communication network an offensive, indecent, obscene, menacing message, matter between November 10, 2014 and May 31, 2015.

A spokeswoman for Scotland Yard confirmed on Tuesday that the case had been discontinued on October 26.

Robert Sharp, of free speech lobby group English PEN, said there was no public interest in the case, which he added should not have been pursued for so long.

"The fact that it's gone on so long is a chill on free speech," he said.

"The police should investigate complaints because credible threats are made on social media.

"However a better law would mean that in this case the investigation could have been closed earlier."

He added: "There was certainly no public interested in going as far as it did, because in the context [Ms Mustafa's comment] was clearly a joke.

"It was a political statement, however inadvisable it was for an elected students' union official to post it."

Reviews conducted under the Victims Right to Review Scheme rarely lead to decisions being overturned.

Just 210 have resulted in u-turns.

More than 1,600 cases have been reviewed.

Goldsmiths students' union is independent of the university and its representatives are elected by members.

Ms Mustafa is neither an employee of the university nor a student.

Solicitors for Ms Mustafa have not responded to requests for comment.