Associated Press
In this May 20, 2013 photo, a Texas Longhorn stands at the Double Helix Ranch near Pontotoc, Texas. David Hillis, a University of Texas geneticist and biologist, and doctoral student Emily Jane McTavish, along with scientists from the University of Missouri-Columbia, conducted research showing Longhorns developed from cattle thousands of years ago in India and Pakistan and from cattle from Europe that bred in Africa and adapted to dry and hot conditions that make them ideal for Texas and the Southwest. (AP Photo/Michael Graczyk)

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A Taliban suicide bomber detonated a vehicle packed with explosives Monday outside the home of a senior police officer tasked with cracking down on militants in Pakistan's largest city.

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