One guy was killed and three others wounded by a knife-wielding guy near Munich with authorities investigating a potential Islamist link, near Munich.
The attacker attacked four commuters shortly before 05:00 (03:00 GMT) on Tuesday at Grafing station. One of the victims died of his wounds in hospital.
A 27-year old German guy detained and was finally overpowered by police.
An Upper Bavaria police representative said that a “political purpose” had definitely not been ruled out.
Authorities spokesman Karl-Heinz Segerer told German television the guy “expressed political motivations” during the strike.
They gave no details, saying it’s an issue for the investigation.
He identified the defendant as a 27-year old German national who will not live in Bavaria.