Suspected of belonging to a terrorist group and of trying to commit murder, a Lebanese student has been formally placed under investigation in connection with an alleged plot to blow up trains in Germany.
The 21-year-old appeared before an investigating judge in the southwestern city of Karlsruhe, after being flown there from Kiel in the north.
The probe follows the discovery of two unexploded bombs found in abandoned suitcases in trains last month.
Arrested at Kiel Station on Saturday, the student is one of two suspects officers have been looking for. The explosives failed to detonate. If they had, police say, many people could have been killed.
The residence where the detained man lived has been searched. It comes as German politicians warned of a growing terrorist threat, urging new measures to counter it.
Video surveillance pictures helped police identify the suspects. The second man is still at large. An intense manhunt is underway.