BBC: Pakistan says information on possible planned attacks in the US came from a computer seized after the arrest of a key al-Qaeda suspect last week.
Proposals were said to be found in e-mails on the computer of Ahmed Khalfan Ghailani, captured after a gun battle.
The US has increased tough security measures in three cities with financial institutions mentioned as likely targets for attack.
US officials said the intelligence used involved "extraordinary detail". Arrest ‘led to US terror warning’ (more)
Mark Alexander
