Tom Foreman Explauns News Today

Welcome back. thanks for starting your morning with us and a special welcome to our troops watching on the american forces network. >> a very special welcome to you. im john berman. its half past the hour right now. >> thousands of law enforcement personnel converged on the boston area to hunt down the marathon bombers. . >> in the end it was key technology that brought in the sole surviving suspect. our tom foreman explauns. >> the stunning images are a testament to the tenacity and the technol...