Pakistan has arrested some 600 Islamic radicals, including a growing number of senior al Qaeda leaders and technical experts. The police admit that their success is the result of an extensive and growing informer network. More cynical observers believe that ISI (Pakistan's CIA) has stopped protecting and aiding al Qaeda, allowing the police to do their job and round up the generally unpopular (because of all the Pakistanis killed by terrorist attacks) al Qaeda members (who are often foreigners, who are also unpopular.)