"Al-Qaida operatives who have been detained for years in Iran have been making their way quietly in and out of the country, raising the prospect that Iran is loosening its grip on the terror group so it can replenish its ranks, former and current U.S. intelligence officials say. This movement could indicate that Iran is re-examining its murky relationship with al-Qaida at a time when the U.S. is stepping up drone attacks in Pakistan and weakening the group's leadership. Any influx of manpower could hand al-Qaida a boost in morale and expertise and threaten to disrupt stability in the region. U.S. officials say intelligence points to a worrisome increase in movement lately. Details about al-Qaida's movements and U.S. efforts to monitor them were outlined to The Associated Press in more than a dozen interviews with current and former intelligence and counterterrorism officials, most of whom spoke on condition of anonymity because they were not authorized to discuss the matter."