Pakistan's top Taliban leader, Baitullah Mehsud, is buying children as young as 7 to serve as suicide bombers in the growing spate of attacks against Pakistani, Afghan and U.S. targets, U.S. Defense Department and Pakistani officials say. A Pakistani official, who spoke on the condition that he not be named because of the sensitive nature of the topic, said the going price for child bombers was $7,000 to $14,000 - huge sums in Pakistan, where per-capita income is about $2,600 a year. "[Mehsud] has turned suicide bombing into a production output, not unlike [the way] Toyota outputs cars," a U.S....