Security expert Will Geddes says that the public shouldn't be too alarmed by the fact that a known terror suspect has entered the Olympic Park.
Instead, he says we should take comfort from the fact that the security services were able to track his movements.
More top news
The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants