The recent string of high-profile arrests in Pakistan of Al Qaeda operatives accused of plotting against financial institutions in the United States resulted not from a meticulously planned counterterrorism operation, but from a lucky break, according to Pakistani police.It was the kind of break investigators dream about: A cellphone that was to trigger an explosion on a busy road in Karachi failed to detonate the bomb. The phone, connected to 18 pounds of explosives, led Pakistani police in the crowded port city to the bombmaker’s house. There, police expected to find a local ”jihadi group” plotting violence against Pakistan, a police officer said. Instead, police found Musaad Aruchi, believed to be the nephew of a top Al Qaeda operative, who helped unravel the most comprehensive discovery of a terrorist plot against the United States since the attacks of Sept. 11, 2001.Full Story