BBC: 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 - two at the airport, two later in Cheshire and a fifth in Liverpool.
Houses in Staffordshire, Liverpool and near Glasgow are also being searched.
Critical condition
Home Secretary Jacqui Smith said the British public would not be "intimidated or let anyone stop us getting on with our lives". PM defiant over ‘al-Qaeda threat’ (more)
Mark Alexander
