The Tunisian national is believed to have hijacked a truck and driven it into a crowd at a busy Berlin market in December. Twelve people were killed as a result of the rampage.
The Islamic State group later claimed responsibility for the attack, when a video was released showing Amri pledging allegiance to IS "caliph" Abu Bakr al-Baghdadi.
Following the rampage, Germany threatened to withdraw foreign aid for countries that refuse to take back rejected asylum seekers.
The heightened state of alert in Germany caused by the market attack also led to its government deciding to deport two German-born terror suspects to Algeria in March.