Stock Photo - Peter Frank, the federal attorney general, prepares to testify in front of an investigation committee of the North Rhine-Westphalian state parliament on the Amri case in Duesseldorf, Germany, 29 March 2017. Frank appeared in the parliament to answer the questions of a committee tasked with investigating the Anis Amri case. Amri was responsible for the terror attack on a Christmas market in Berlin late last year which left twelve people dead. The committee is tasked with determining how Amri was able to carry out the attack despite being known to the security services who had classified him as a potential Islamist threat and placed him under surveillance. Photo: Federico Gambarini/dpa | usage worldwide. - Düsseldorf/North Rhine-Westphalia/Germany