The Reichstag
The Reichstag Joachim Thurn, German Federal Archive

A terror alert has been issued in Germany. According to Der Spiegel, terrorist groups are planning an attack on the nation's parliament building, the Reichstag.

Al-Qaeda and similar groups planned to take hostages in the building, the paper said. The attack is to take place early next year.

The report was based on testimony from a terrorist who turned informant and told the German authorities of the plan. The terrorist is reportedly part of a six-man cell, two members of which are already in Berlin.

German officials raised security at airports and train stations last week. Interior Minister Thomas de Maiziere announced that there was “concrete” evidence that terrorists were plotting attacks to take place in November. There is “reason for concern, but not for hysteria,” he said.

In  a speech given Saturday, Chancellor Angela Merkel encouraged citizens not to be afraid. The terrorist threat is real, but “security forces are doing everything possible to protect us,” she said. Merkel declined to confirm or deny the Der Spiegel report.