Germany's chief federal prosecutor has said the investigation into the Berlin lorry attack will continue to determine if the suspect, Anis Amri, had any accomplices.
"Even though the suspect Anis Amri has died, we'll continue our investigation," Peter Frank said.
"It's very important for us now to find out whether there was a network of supporters and accomplices, whether there were confidants who helped the sought person to prepare and conduct the attack and to escape."
He continued that 24-year-old Amri had been confirmed as the man killed.
Prosecutors in Germany also want to determine if the gun Amri was carrying in Milan is the same one used to shoot the driver of the lorry the 24-year-old commandeered for the attack.
Amri was shot dead in the early hours of the morning in Milan.
The funeral for the lorry driver killed in the Berlin Christmas market attack has taken place in his home country of Poland.
Footage has emerged of the final moment before a truck ploughed into a crowd of people at a Christmas market in Berlin.
A man is being hunted by German police after a lorry ploughed into a Berlin Christmas market on Monday, killing 12, but who is the suspect?