UK terror threat level raised: As it happened

Key Points

• The UK's terror threat level has been raised from "substantial" to "severe" in response to conflicts in Iraq and Syria
• Home Secretary Theresa May says the new alert level means an attack on the UK is "highly likely" - but there is no intelligence to suggest one is "imminent"
• PM David Cameron says Islamic State extremists pose a "greater and deeper threat to our security than we have known before"
• Mr Cameron announces new legislation to make it easier to take passports away from Britons travelling to join the conflicts