Commemoration of 1st anniv of Christmas market attack held in Berlin

Since then, many of those affected in the attack have complained about a general lack of support, difficulties in contacting responsible officials and slow decision-making processes.

Additionally, questions still remain as to whether European police forces coordinated well enough, or could have even prevented the attack, given that Amri was known by authorities to be potentially violent.

"We were not adequately prepared to deal with the implications of such an attack for those affected by it," German Justice Minister Heiko Maas told the newspaper Tagesspiegel.

Maas wrote that his government consequently "owed an apology to the victims and their surviving loved ones".

The German justice minister voiced his support for initiatives proposed by Kurt Beck, the specially-appointed Commissioner for Victims, to improve financial assistance for individuals injured in the attack and victims' families, as well as creating a centralized coordination unit within the federal government which people could turn to in the event of future terrorist incidents.

Several events are scheduled for Tuesday in Berlin which will include the unveiling of two physical structures to mark the date.