Shackled and surrounded by federal marshals, Pakistani-American terror suspect David Coleman Headley, pleaded not guilty to charges that he planned the 2008 Mumbai terrorist attacks that killed 166 people.

Son of a Pakistani diplomat and an American socialite mother, Headley, 49, appeared Wednesday before US District Judge Harry Leinenweber in Chicago for an arraignment that lasted only about three minutes. He then was led away, guarded by a phalanx of federal marshals.