September 11, 2001 attacks began after the U.S. war left 225,000 people and cost up to U.S. $ 4.4 trillion, according to university researchers to a new study.

Brown University study published this week in America on 9 / 11 attacks, Pakistan and Yemen, which came after Iraq, Afghanistan and counter-terrorism campaigns, battles for the attention.

A study of death "very conservative estimate" of 225,000 people were killed and 365,000 injured so far reported in the wars. The number of soldiers killed 6,000 Americans, 1,200 allied troops, 9,900 Iraqis, 8,800 Afghans, including 3,500 Pakistanis and 2,300 U.S. private security contractors, to 31,741, it said.

About 125,000 Iraqis, the number of civilians, including 35,000 Pakistanis and Afghans to 12,000, with nearly 172,000 dead, was very high, it said.