Former English Defence League leader Tommy Robinson has responded furiously to Mark Rowley after the police chief cited him as a source of growing far-right extremism.
Rowley, the outgoing head of the UK's counter-terror police force, was speaking about the growing threat posed by right-wing violence in a speech at the Policy Exchange thinktank.
He cited Robinson as one of a number of influential people who have circulated "extremist rhetoric with the common goal of increasing tensions and divisions in communities."
Robinson has not been accused of any terror offence, although the recent trial of Darren Osborne heard that he had been inspired by messages posted by the former EDL figurehead.
In response to Rowley's speech, Robinson wrote on Twitter: "This is a blatant attempt by the police to slander & attack me . They can’t give a single example of my “extremism”.
Robinson, who regularly posts about Islamic extremism on social media, also said that, if Rowley had "followed my Twitter and took action," he may have thwarted the Westminster terror attack last spring.
In addition to his own flurry of messages, Robinson retweeted a number of posts from other accounts, including from former BNP leader Nick Griffin, criticising Rowley's messages.
One of the posts said far-right extremism was "a response to Islamism, a response to police and government negligence" and told Rowley to "stop blaming the victims, do your job."