BERLIN, Dec. 31 (Xinhua) -- Some goods sold at duty-free shops in airports pose a potential security risk and should be banned, German security and aviation officials said Thursday.

    "After passing through security checks, potential attackers can get everything they need to make a bomb in duty-free shops and restaurants," said police union chief Rainer Wendt.

    Wendt said the European Union (EU) should "introduce as quickly as possible an EU-wide ban on selling potentially dangerous items like alcohol, perfume and similar things" in duty-free airport shops located past the security checkpoints.

    The attempted terror attack on a U.S. airliner on Dec. 25 prompted German officials to call for stronger airport security.

    A German police chief warned Tuesday that there were obvious flaws in German airport security systems, including insufficient security staff and vigilance as well as the lack of modern technology.

    German airport security screeners fail to find as much as 30 percent of weapons hidden in carry-on baggage during tests by undercover officers, said Konrad Freiberg, chairman of the national police union.

    The German government also issued a statement on Thursday urging less carry-on baggage.

    "Travelers should take as little baggage as possible onto planes to help avoid delays," Interior Minister Thomas de Maiziere said.