TORONTO - An anti-terrorism probe that led to the arrest of 19 Pakistani men, including one who took commercial flight training over a nuclear power plant, highlights security holes that should have been plugged after the Sept. 11, 2001 terror attacks, Ontario officials said. The Public Security and Anti-Terrorism Unit, a federal national security task force, quietly arrested the group of mostly young men last week. The men appear to have used fraudulent student visas to enter Canada or to maintain their residency here. Federal authorities documented a pattern of suspicious behaviour that shows an interest in Ontario's nuclear generators...