German police have detained two people in the city of Duisburg on suspicion of preparing a terrorist attack, German media report.
Two men, Kosovo-born brothers aged 28 and 31, were detained in the early hours of Friday, Der Spiegel said. According to the news magazine, police believe they were planning an attack on a shopping center in Oberhausen.
Police are now investigating whether other people could be involved in the suspected plot.
All Christmas markets and shops were closed at the CentrO mall on Thursday evening as police conducted a special operation at the shopping center, according to Der Spiegel.
On Monday, a truck rammed into the crowd at a Berlin Christmas market on the Breitscheidplatz square, killing 12 people and injuring over 40 others.
The country’s Interior Ministry considers the incident a terrorist attack. A nationwide manhunt continues for Anis Amri, a 24-year-old asylum seeker from Tunisia, whose residence permit was found in the hijacked Polish truck. Police also found his fingerprints on the door of the truck.