From NBC's Robert Windrem 

2,974 killed
New York and Washington, D.C. Sept. 11, 2001
Four planes plunge into the World Trade Center, Pentagon and a Pennsylvania field. 

477 killed
Abadan, Iran. Aug. 20, 1978
Anti-shah radicals commit arson in a movie theater during the Iranian revolution.

400 killed, at least
Yazidi villages, Iraq. Aug. 14, 2007
Al-Qaida uses four suicide bombs to kill members of the Yazidis, a small religious group. The death toll is mounting and could be as high as 500.

334 killed
Beslan, Russia. Sept. 1, 2004
Armed Chechen rebels take more than 1,200 schoolchildren and adults hostage. Of those killed, 186 are children.

329 killed
Irish Sea. June 23 1985
A terrorist bomb explodes on an Air India plane. The attack is blamed on Sikh radicals.

299 killed
Beirut, Lebanon. Oct. 23, 1983
Suicide truck bombings strike U.S. and French marine compounds. Hezbollah claims responsibility.

270 killed
Mumbai, India. March 12, 1993
Twelve bombs and a grenade explode in India’s financial district. Muslim radicals are found responsible, with possible collusion of a Pakistani intelligence service.

270 killed
Lockerbie, Scotland. Dec. 21, 1988
Libyan terrorists bomb a Pan Am plane as it flies from London to New York. 

224 killed
Nairobi, Kenya, and Dar Es Salaam. Tanzania, Aug. 8, 1998
Al-Qaida suicide truck bombs explode at U.S. embassies in the two capitals. The Nairobi attack kills 212.

215 killed
Baghdad, Iraq. Nov. 23, 2006
Mortar fire and five car bombs detonate in Baghdad's Shiite Muslim enclave of Sadr City.

202 killed
Bali, Indonesia. Dec. 2, 2002
Truck bombs explode outside Indonesian nightclubs. Al-Qaida finances the attack, and Indonesia terrorists carry the plot out. 

191 killed
Madrid, Spain. March 11, 2004
Eleven knapsack bombs placed by Muslim radicals explode on four commuter trains. This is Europe's worst terrorist attack.

183 killed
Mumbai, India. July 11, 2006
Seven bombs placed by Muslim radicals in first-class carriages of commuter trains rock the financial center.

181 killed
Karbala and Baghdad, Iraq. March 2, 2004
At least six bombs kill Shiite worshippers at holy sites in the two cities. Al-Qaida in Iraq is blamed.

170 killed
Tiniri Desert, Niger. Sept. 19 1989
Libya admits responsibility for a bomb aboard a Union de Transportes Airiens plane.

168 killed
Oklahoma City, Okla. April 19, 1995
A domestic terrorist truck bomb destroys a federal building. Tim McVeigh is later executed, and his compatriot given a life sentence.

150 killed
Luanda, Angola. Aug. 10, 2001
Rebels attack a train south of the Angola capital.

150 killed
Anuradhapura, Sri Lanka. May 14, 1985
Tamil Tigers militants attack a civilian crowd in the city streets. 

143 killed
Budennovsk, Russia. June 14-19, 1996
Hostage-taking and failed rescue attempts in an area near Chechnya leave scores dead. 

140 killed
Kattankudy, Sri Lanka. August 1990
Attacks on two mosques by Tamil rebels occur during Sri Lanka's long civil war.

130 killed
Lubango, Angola. Nov. 8 1983
A TAAG-Angola Airlines plane is shot down by guerrillas.

130 killed
Moscow, Russia. Sept. 13, 1999
Chechen rebels blow up an apartment building. 

129 killed
Moscow, Russia. Oct. 26, 2002
Hostage-taking by Chechen rebels and a failed rescue attempt at a Moscow theater leave scores dead.

125 killed
Karbala, Iraq. Aug. 29, 2003
Two car bombs explode outside the Imam Ali Shrine. 

125 killed
Hilla, Iraq. Feb. 28, 2005
A suicide car bomb attack strikes Hilla, a city south of Baghdad.
 
Source: NBC's Robert Windrem

Updated: 4:46 p.m. ET Aug. 16, 2007

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