BBC:
There are mounting fears that Yemen is becoming a leading al-Qaeda haven.The pot of money isn't endless. This is the cost of George Bush, and Joe Lieberman's, war in Iraq. We lost a trillion dollars that we could have used for lots of other things.
Mr Brennan, the US Deputy National Security Adviser for Homeland Security and Counterterrorism, told ABC's This Week TV programme that the group had "several hundred members" in Yemen and was posing an increasing threat there.
"This is something that we've known about for a while," he said. "We're determined to destroy al-Qaeda, whether it's in Pakistan, Afghanistan, or in Yemen."
He also said the US believed the group was "planning to carry out an attack against a target inside of Sanaa, possibly our embassy".
