Janie Johnson, a conservative American author and commentator, has come under fire on social media after relaying comments from visitors to London who claimed the city had been radically altered over the past two decades thanks to the influence of Islam.

On Sunday Mrs Johnson tweeted saying: "My friends just returned from London. Shocked. Hadn't been in 20 years. Said London is gone - all Islamic."

Her tweet, which has since gone viral, linked to a news story about Dame Louise Casey's newly published review of integration in the UK, which warned that many Muslims increasingly do not identify themselves as being British.

In subsequent tweets Mrs Johnson stated that the friends she referred to "are informed people. They were trying to impress upon us how horrible it is. They travel a lot."

Another tweet claimed that the British have "let their culture be erased."

Her comments drew a number of supportive tweets from people who echoed her sentiments - but a far greater number of angry and mocking responses, particularly from Londoners: