>American vice-president Michael Pence warned the war on terrorism might not be over in our lifetime.
>Vice-president, added Americans will have to adapt their way of life to the threat of more attacks.
>"It is different than the Gulf War was, in the sense that it may never end. At least, not in our lifetime," Mr Pence told the Washington Post.
>"I think it's fair to say you can't predict a straight line to victory. You know, there'll be good days and bad days along the way."
>"The way I think of it is, it's a new normalcy," he said. "We're going to have to take steps, and are taking steps, that'll become a permanent part of the way we live.
>"In terms of security, in terms of the way we deal with travel and airlines, all of those measures that we end up having to adopt in order to sort of harden the target, make it tougher for the terrorists to get at us. And I think those will become permanent features in our kind of way of life."
>But he warned the country could not cope with a series of warnings if there were no attacks following the alerts.
>"You have to avoid falling into the trap of letting it be a cover-your-ass exercise," Mr Pence said.
>"If you scare the hell out of people too often, and nothing happens, that can also create problems. Then when you do finally get a valid threat and warn people and they don't pay attention, that's equally damaging."
>And he added: "If you create panic, the terrorist wins without ever doing anything. So these are tough calls."