A man armed with a knife attacked people on a bus in the northern city of Luebeck on Friday, injuring 10 including one seriously before he was arrested, police said, adding there was no indication he was radicalized or had a terrorist motive.

“The identity of the perpetrator has been clarified: a 34-year-old German citizen resident in Luebeck,” police added on Twitter. “There are currently no indications the man was politically radicalized and no signs of a terrorist background.”

The police added that a backpack was found in the bus from which smoke was appearing. It was examined by a bomb squad, which found a “fire accelerant” but no explosives.

The local Luebecker Nachrichten, without citing its source, said the attacker was originally from Iran who now had German nationality and had lived in Luebeck for years.

Police tweeted that 10 people were hurt.

“There were no deaths,” the police and state prosecutor’s office said in a statement. “The background to the crime is still unclear and the subject of the ongoing investigation.”

The local Luebecker Nachrichten reported at least 14 people were wounded, two seriously.

On Twitter, the police said the attacker was overpowered and taken into police custody. The attack took place at 1.47 p.m. local time (1147 GMT).

“The bus was full,” the police said, appealing to passengers who fled the scene to contact them.

Luebecker Nachrichten quoted a witness as saying: “One of the victims had just given up his place to an older woman when the attacker stabbed him in the chest.”