The Bild newspaper reported that 12 people were "slightly injured" while two other passengers were seriously injured due to the attack in a bus.
At least 14 people were injured in the northern German city of Lübeck on Friday in an apparent knife attack on a bus, according to local media.
Police spokesman Duerk Duerbrook said authorities were still trying to work out the circumstances surrounding the attack on Friday afternoon.
Luebeck police were not immediately available for comment. It was bad. Then the injured were brought out.
"The passengers jumped out of the bus and were screaming", said Lothar H, a witness who lives close to the scene.
A police vehicle which happened to be close by arrived at the scene quickly, allowing officers to detain the assailant, added the report.
Earlier, police in Schleswig-Holstein tweeted that there was a major police deployment under way in the city.
Passengers then overpowered the man outside the bus and held him for police.
In Berlin in December 2016, a Tunisian whose request for asylum was turned down and who had links to Islamist militants hijacked a truck and ploughed into a crowded marketplace.
The police confirmed that some people have indeed been wounded but said that no one was killed.
Germany has since been targeted again in attacks with radical Islamist motives. Hingst said it wasn't clear whether it belonged to the suspect, but said there had been reports of smoke coming out of it.