ITV News Facebook users have been commenting on government plans to give more protection to homeowners who are confronted by burglars. Join the debate here.
Diane Procter: "Everyone has a right to defend their home and families, whatever it takes to keep people out."
Nick Sanbrooke: "At last! Some common sense!"
Beth Jones: "As a single parent its my job to protect my daughters so if someone broke in my house i will do everything it takes to get them out or stop them!"
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The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.
Prime Minister Theresa May announced the decision from Downing Street.
A man, apparently armed with a small axe and a large stick, was detained close to the event and police cleared the area as a precaution.