BERLIN Christmas market attacker Anis Amri used eight different aliases to collect welfare benefits in order to finance his horrific terror attack on the Berlin Christmas market which left 12 people dead, reports have claimed. Despite being shot dead in Italy just days after the attack, the Tunisian refugee is now under investigation for fraud after conning German authorities into handing over cash to fund his terror exploits. After travelling from Tunisia to Europe in 2011, he used up to eight different aliases and several different nationalities - at times even claiming to be from Egypt or Lebanon.Reports claim Amri carried several different false identity documents and used aliases to collect welfare in cities across Germany. Authorities also found Amri had used the internet to try and find a way of contacting Daesh, as well as looking up instructions on how to build bombs. Reports suggest Amri was known to German authorities months before he carried out the devastating attacks but they failed to act in time.Although considered a potential threat, he was labeled ‘unlikely’ to carry out a terror attack by counter-terrorism officers on at least two occasions. Welfare fraud was key to funding terror attacks in Brussels in March and in Paris last year. Terrorists collected around £45,000 in benefits which they used to pay for the brutal attacks in the major European cities.Meanwhile, Danish authorities came under fire recently after it emerged 36 Islamic State fighters continued to receive benefits for months after leaving the country to join other members of the brutal regime in Syria and Iraq.Troels Lund Poulsen, Denmark’s employment minister, said: "It is totally unacceptable and a disgrace. It should be stopped.” The terror attacks in Berlin caused police forces across Europe to bolster security efforts ahead of New Year’s celebrations.