An armed police officer patrols by a security cordon set up along Whitehall by the Houses of Parliament, London.
A report released Monday (18 December) from the Cardiff University Crime and Security Research Institute (CSRI) revealed the posts were part of a "systematic" campaign directed at the UK.
It said the level of influence some accounts had was "more extensive than has been reported to date".
One of the tweets noted by the Cardiff researchers was a @TEN_GOP screenshot taken from news footage of the London Bridge attack, claiming Muslims had been laughing at the scene.
A separate anti-Islam tweet, posted following the Manchester bombing, had been circulated thousands of times. The divisive message stated: "Another day, another Muslim terrorist attack. RETWEET if you think that Islam needs to be banned RIGHT NOW!"
that the number of original messages from fake accounts reached 293 following the attack in Manchester, 35 after Westminster, 140 after London Bridge and seven after the incident at Finsbury Park. The accounts attempted to gain support from UK right-wing figures, including Nigel Farage and Tommy Robinson, in order to boost their reach.