Investigators say the 24-year-old Tunisian drove a truck into the market on December 19, killing 12 people. He was killed December 23 in a shootout with Italian police in a Milan suburb.
Amri came to Germany in mid-2015. Authorities later put him on a list of potentially violent Islamic extremists. Separately, he was investigated for receiving benefits simultaneously under two different identities.
The head of North Rhine-Westphalia state's criminal police, Dieter Schuermann, told regional lawmakers Thursday that authorities couldn't find evidence of possible attack plans that would stand up in court, news agency dpa reported.
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