A recreational vehicle parked in downtown Nashville exploded early Christmas morning, injuring three and causing widespread outages, including for the police emergency system. Police believe the explosion was intentional. As authorities continue to investigate, Kimberlee Kruesi of the Associated Press…

As part of a series of reports from Yemen, Margaret Warner reports on the country's anti-terrorism units on the Arabian Peninsula and the impact of military aid from the U.S. to the impoverished country in the fight against al-Qaida.

As growing al-Qaida activity in Yemen gives rise to increasing U.S. security concerns, Ray Suarez talks to correspondent Margaret Warner about her ongoing reporting trip in the Arabian Peninsula.