The UK is reviewing its terror preparedness and responses if faced with attacks like those seen in Paris last week.
Prime Minister David Cameron has chaired a security meeting which agreed events in Paris should be considered in future UK training exercises.
Security will also be ramped up with the aim of preventing extremists bringing weapons into the UK.
But Mr Cameron also wants to give security services extra powers for monitoring online and phone conversations of terror suspects - something human rights campaigners oppose.
Olly Barratt reports from London.
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David Cameron says last week's attacks in Paris should focus minds on giving security services more powers to monitor communications.
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Since the Charlie Hebdo massacre The boss of Britain's spy service Mi5 has called for more powers for his agents.
But Human rights lawyer Simon McKay says intelligence agencies need to be deal better with the information they're already gathering.
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Robin Bloomfield - security expert at City University - agrees with that sentiment.
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But he cautions that just because those convicted over the murder of soldier Lee Rigby on a London street in 2013...
And those who carried out the paris attacks...were known to authorities before those incidents..
That doesn't mean intelligence agencies necessarily failed...
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The government already has a counter-terrorism bill making its way through parliament - that contains controversial proposals to block terror suspects returning to Britain and to give universities a statutory obligation to try and prevent students being radicalised.
Some objections to the legislation will be laid out on Tuesday at westminster when it has its second reading in the House of Lords.
OB, LDN