Some of the al-Qaida operatives whose activities led to a U.S. security warning last month have been captured, while others remain at large, U.S. counterterrorism authorities say. "We have received a lot of good information from these detainees over the past several weeks and corroborated the fact there were active plans, ongoing, to conduct another attack in the United States," said William H. Parrish, a top intelligence official with the Homeland Security Department, during a recent interview with The Associated Press. "This attack as they indicated was probably going to be multiple attacks, simultaneous," he said...