Gina Miller was the lead claimant in the case against the UK government's plan to invoke Article 50 to trigger formal negotiations for Britain's exit from the European Union (EU) without parliamentary consent.
The 51-year-old won her case yesterday when the Supreme Court ruled that British Prime Minister Theresa May must seek parliamentary consent before triggering the formal Brexit process.
However, the investment fund manager has claimed she has been the target of a number of online attacks and had filed a report against such attacks late last year.
"Officers from the Met's Operation Falcon have arrested a 50-year-old man at an address in Knightsbridge on suspicion of racially aggravated malicious communications. The arrest is in connection with a complaint made to police by a 51-year-old woman relating to threats made online and a second unrelated comment believed to have been made by the same suspect," a Scotland Yard statement said.
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The arrested man remains in custody at a central London police station.
"As part of the same investigation, officers have issued eight cease and desist notices to individuals in various parts of the UK. A cease and desist notice takes the form of a notice served by police advising the recipient that to continue with their current actions or behaviour could result in police action," the Met Police statement said.
The Met had previously arrested a 55-year-old man on similar suspicion of "racially aggravated malicious communications" against Miller but released him without further action.
"I have therefore been shocked by the levels of personal abuse that I have received from many quarters over the last seven months, for simply bringing and asking a legitimate question," Miller said.
"I sincerely hope that going forward, people who stand in positions of power and profile are much quicker in condemning those who cross the lines of common decency and mutual respect," she had said.
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