Pakistan needs to "do more" to root out terrorism emanating from its soil, British Prime Minister Gordon Brown has said, a day after the police there arrested 12 al-Qaeda suspects, including 11 Pakistanis, over a "very big terrorist plot".

Brown's remarks follow resignation of the UK's top counter-terrorism expert Bob Quick after a security blunder by the police officer, who inadvertently disclosed a covert surveillance operation against al-Qaeda suspects, forcing premature raids by police across north-west England.