NEW DELHI, Dec. 8 (Xinhua) -- India will formally chargesheet arrested Pakistani-origin American David Coleman Headley in the Mumbai terror attacks case and also seek his extradition from the U.S., Indian Home Ministry sources said Tuesday.

    "India's newly formed National Investigation Agency will charge Headley for plotting the Mumbai terror attacks at the behest of Pakistan-based banned terror outfit Lashker-e-Toiba (LeT) and try to extradite him to face trial in this country," the sources said.

    The U.S. has already indicted Headley on six counts of conspiracy on the Mumbai terror attacks.

    According to FBI chargesheet, Headley conducted surveillance of targets in India for more than two years before the November 2008 attacks that killed 170 people, including six U.S. citizens.

    He changed his name from Daood Gilani in 2006 to Headley around Feb. 16, 2006 after he was told by his Pakistan handlers in the LeT that he would be used to scope out terror targets in India, the chargesheet says, adding he attended training camps in Pakistan in 2002 and 2003.

    According to the FBI, Headley had also delivered, placed, discharged and detonated explosives and other lethal devices in, into, and against places of public use in India in the run-up to the attacks last year.