BERLIN--German police evacuated a popular Christmas market in the city of Potsdam on Friday before destroying a suspicious package containing nails and an unidentified powder in a controlled explosion, officials said. Potsdam police said it was too soon who may have been responsible. Police were alerted at about 2:30 p.m. local time after the package was delivered to a pharmacy on the same street as the Christmas market, police spokesman Peter Meyritz told the Potsdamer Neueste Nachrichten newspaper. Read more: The New York attack was the latest where a vehicle was used as a weapon. A look at the othersMeyritz wasn't immediately available to provide further details, but told the newspaper that the package measured about 40 centimetres by 50 centimetres and was apparently delivered by a messenger service.