The shooting happened at a Rewe supermarket in Germany, STAR DAILY reports.
Cops confirmed the suspect is on the run after the incident in the Gropelingen area of the north-western city of Bremen.
But they said there is no immediate risk to the public.
"The background is not clear," the local force said in a statement.
Eyewitnesses said a man was shot several times and is seriously injured.
They reported a loud dispute between two men before the shooting.
"Suddenly one of them drew a weapon and shot around," one wrote on Twitter.