Is Angela Merkel responsible for the 2016 Berlin Christmas market truck attack?

On 19 December 2016, at about 20:00 local time, a truck ramming attack was made on the Christmas market at Breitscheidplatz in Berlin, killing twelve people and injuring 48 others. It was reported that the suspect is a 23-years old male Pakistani refugee Naved B, who had come to Germany on 16 February 2016.[source]

As a leader of Germany, is Angela Merkel responsible for the deaths and injuries that were caused by this attack?

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