"Hans-Jakob Schindler, senior director of the Counter Extremism Project, told the BBC: “No car should come close, let alone be on a Christmas market. There has to have been a gap that no one realised needed to be closed.”"

"Local authorities believe the suspect acted alone, however Hans-Jakob Schindler - a counter-terrorism expert has said it's too early to dismiss that the driver was working with others.

The senior director of the Counter Extremism Project at the International Center for Counter-Terrorism (ICCT) believed reports of a 'suspicious bag' could indicate that the suspect had help."

"Hans-Jakob Schindler, senior director of the Counter Extremism Project, says the gap that allowed the attacker to access the market must be "explored and rectified".

"No car should come close, let alone be on a Christmas market," he tells the BBC News channel."

"A teacher was killed and several of her students were injured Wednesday when a man, seemingly deliberately, drove his car into a group of pedestrians in Berlin.

On this week’s episode of 'The Hunt With WTOP National Security Correspondent J.J. Green,' Hans-Jakob Schindler — a senior adviser for the Counter Extremism Project who also lives and works in Berlin — explains what happened."