Turkish intelligence agents are infiltrating mosques, monitoring underground Web sites and investigating Islamic front charities but are having little success penetrating al-Qaida’s tight-knit cells, agents and anti-terror police say. It is a common frustration around the world, with police in Italy, Britain and dozens of other countries finding it difficult to penetrate al-Qaida, a loosely knit terrorist organization where family ties and close personal relationships are often key. Full Story