An American who helped plan a terror attack that killed more than 160 people, including six Americans, has been sentenced to 35 years in federal prison. David Headley, an American citizen of half-Pakistani descent, was convicted of conducting scouting missions that helped 10 men from Pakistan's Lashkar-e-Taiba terror group armed with grenades and automatic rifles mount a multi-day assault in Mumbai, India in November 2008.

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