New federal charges filed against suspected Lashkar-e-Taiba operative David Coleman Headley accuse him of conducting extensive surveillance of targets in Mumbai for more than two years before last year's deadly attacks that took the lives of 166 people.

Headley, an American citizen of Pakistani origin, already accused of plotting to murder a Danish newspaper cartoonist, was Monday charged with six counts of conspiracy to bomb public places in India, to murder and maim persons in India and Denmark, to provide material support to foreign terrorist plots and to provide material support to Lashkar-e-Taiba, a Pakistani-based militant group.