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Britain’s terror threat level was raised from ‘substantial’ to ‘severe’ in response to fighting in Iraq and Syria, meaning that an attack on Britain was ‘highly likely’. Three days later, David Cameron, the Prime Minister, in a hesitant statement to the Commons, proposed that: police should be able to seize temporarily at the border the passports of people travelling overseas; there should be all-party talks on drawing up powers to prevent suspected British terrorists returning to Britain; those under terrorism prevention and investigation measures (Tpims) should be subject to ‘stronger locational constraints’.