From CBS 2:
The search is on for up to a dozen terrorists, possibly planning an attack on the United States. The FBI is looking for those associated with Najibullah Zazi, one of three already under arrest.
Sources told CBS 2 on Monday the plot may have focused on mass transit.
As the three men made their first court appearances in Denver and in Brooklyn, law enforcement sources said they are still tracking a core group of nine to 12 people with knowledge of the alleged terror plot. And the plan to use homemade explosives to bomb one or more terror targets in New York City may just have been temporarily interrupted.