Update (16:00 PST): The attacker reportedly yelled "Allahu Akbar" before he started attacking with both a knife and axe.
Update (15:04 PST): The Minister of the Internior of Bavaria has stated that the attacker was a 17 year old refugee from Afghanistan.
A man wielding an axe attacked more than 20 people on a train the southern Germany town of Wurzberg.
According to the local media organization Bayerischer Rundfunk, the police commented that he was using "cutting and stabbing weapons."
Four people are said to be currently in critical condition.
The attacker fled the scene and was quickly shot and killed by the local police.
This post will be updated as more information surfaces.