U.S. security officials are increasing efforts to thwart possible acts of terrorism in advance of the 10th anniversary of the September 11th, 2001, terror attacks. While the U.S. Department of Homeland Security has not issued specific alerts, law enforcement agencies across the country have heightened security to prevent an assault by al-Qaida and its affiliates or by people acting on their own. VOA's Chris Simkins has more on the story.
