Experts weigh in on the challenges of preventing similar terror attacks and efforts to protect the U.S. amid the holiday season
The president-elect lambastes the former president on Twitter; Clinton reponds
Prosecutors said they released the only person arrested in connection with the attack because of lack of evidence
Russia and Turkey say the killing was an attempt to disrupt their relationship -- but on the face of it, it looks like an act of retribution
Police believe truck loaded with steel was deliberately rammed into crowded market, killing 12 people and leaving dozens injured
In his eight years in office, President Obama left his mark on many different aspects of American life
In response to the apparent terrorist attack at a Berlin Christmas market, authorities in the U.S. have increased security at specific sites.