A heroic passer-by who helped apprehend the London Bridge attacker says he "tried his best" to prevent him taking more lives by "stamping on his wrist". Tom Gray, a tour guide who was in the capital on business with his friend Stevie, was one of the brave members of the public who put their lives in danger to save others. Report by Blairm. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn