BERLIN—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.
The head of the Federal Criminal Police Office, or BKA, said it couldn’t rule out that a suspect or suspects involved in the Monday night attack may still be at large, despite the high-profile arrest of a man shortly after the incident.

Map locates Christmas market where the truck attack happened. Via AP





