UPDATE: 6:30 a.m. EDT — Germany’s state office said Tuesday that the man who attacked passengers at a train station in the Munich area is a 27-year-old from the state of Hesse. Munich’s prosecutor’s office said that so far there was no concrete evidence to link the suspect to any terror group or network, NBC News reported.

Original story:

One person was killed and three others injured after a man attacked passengers at a train station in the Munich area early Tuesday. Police are investigating an Islamist motive as witnesses said that the man shouted "Allahu Akbar" ('God is Great' in Arabic) during the attack.

The attack occurred in the S-Bahn commuter train station at Grafing, a town about 20 miles southeast of the Bavarian capital in southern Germany. A police spokeswoman reportedly said that a suspect has been arrested and authorities are looking for a motive into the incident. The suspect is a 27-year-old German national, NBC News reported, citing police.

"The assailant made remarks at the scene of the crime that indicate a political motivation — apparently an Islamist motive," a prosecutor's spokesman said. "We are still determining what the exact remarks were."

German police blocked the entrance to Munich area station following the stabbing attack, while railway operator Deutsche Bahn told the Associated Press that at least one platform at the station was expected to remain closed through midday.