Britain will not yield despite a sustained threat from people associated with al-Qaeda, Gordon Brown has said after three terror attacks in the UK.The prime minister was speaking after a burning car driven into Glasgow Airport on Saturday was linked to two car bombs found in London's West End on Friday.
Five people have been arrested over the attacks and police are searching houses in the village of Houston near Glasgow.
Two were held at the airport, two later in Cheshire and a fifth in Liverpool.
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