In the aftermath of Saturday's terror attack in London, one US commentator has been widely ridiculed on social media for suggesting that more guns were the answer to terrorism

Jack Posobiec, an 'alt-right' activist, writer and former Donald Trump campaign volunteer, tweeted a photo of a Nascar race on Sunday, saying: "There's never been a terrorist attack at a Nascar race. Nascar fans are all armed. Draw your own conclusions."