Two Afghans arrested on suspicion of killing man in east Germany
The police and the public prosecutor's office said in a short statement: "Two Afghans were provisionally detained on suspicion of homicide ... The reasons for, and concrete circumstances of, the incident are not yet known."
The state premier of Saxony-Anhalt, home to Koethen, said protests there must not turn out like those in Chemnitz.
"Despite all the emotional, every attempt to turn Koethen, as is being said on the internet, into a second Chemnitz, must be rejected," the Mitteldeutsche Zeitung newspaper quoted state premier Reiner Haseloff as saying.
Germany is deeply divided over Chancellor Angela Merkel's 2015 decision to allow in over a million migrants, many of them refugees from wars in Syria, Iraq, and Afghanistan.
A row over the veracity of reports that supporters of the far right hounded migrants in Chemnitz has inflamed tensions over immigration in Merkel's 'grand coalition' only two months after she reached a truce with her Bavarian sister party on the same issue.
Interior Minister Horst Seehofer, of the Bavarian Christian Social Union (CSU), on Wednesday, said: "Migration is the mother of all problems."