Photo Gallery Germany on Rail Bomb Alert
Travelers at Berlin's central station faced disruptions after a series of petrol bombs were discovered along railway lines in the German capital last week.
A police man detonates a device on the route from Berlin to Hamburg. In total, 18 firebombs have been discovered in and around the capital, sparking a new debate about left-wing radicalization.
Police hunt for evidence around the site of a bomb. Federal prosecutors have launched an investigation.
Railway operator Deutsche Bahn has posted a 100,000 ($138,000) reward for information leading to the arrest of the perpetrators.
Hermann Gröhe, the general secretary of Chancellor Angela Merkel's center-right Christian Democratic Union (CDU), calls the attacks a "dramatic wake-up call" for democracy.
