Berlin attack suspect Anis Amri used at least 14 different identities

BERLIN – A police official says that German authorities knew of 14 different identities used by Berlin Christmas market attacker Anis Amri.

Investigators say the 24-year-old Tunisian drove a truck into the market on Dec. 19, killing 12 people. He was killed Dec. 23 in a shootout with Italian police in a Milan suburb.

READ MORE: Berlin attack truck’s automatic braking system may have saved lives

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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.

WATCH: Berlin attack suspect killed in shootout with police

2:52 Berlin attack suspect Anis Amri killed in shootout with police in Milan

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. He said they “exhausted all legal powers to the limit to ward off potential dangers.”