Germany frees man arrested after deadly Christmas attack

German authorities are calling the truck attack on a crowded Christmas market an "act of terrorism" that had all the hallmarks of Islamic extremism - but many questions remained over who carried out the attack that killed 12 people and wounded nearly 50 in the heart of Berlin.Federal prosecutors on Tuesday night released a man taken into custody in the vicinity of the crime on suspicion that he drove the vehicle in the attack Monday night, saying they hadn't found evidence putting him in the tru