Lubeck Police: No Indication Knife Attacker Has Terrorist Background

German police have so far found no connection between a man who wielded a knife on a bus in Lubeck and any radical or terrorist organizations, the police's press service said on Friday.

Earlier in the day, a man attacked passengers on a bus with a knife, injuring ten people. According to local media, the attacker is of Iranian origin.

"The offender's identity has been determined: a 34-year-old German citizen, Lubeck resident. There are currently no indications of the man's radicalization [and] currently no signs of a terrorist background," the police said on Twitter.

The police also said that the backpack the attacker left on the bus had been defused. There was an incendiary substance inside, but no explosives were found, the police specified.

The surge of stabbing and ramming attacks in EU states has reportedly coincided with the outbreak of the migration crisis, which is raising major concerns about the European Union’s refugee and external border security policies.

The attacks in Europe have also revealed a surge in online recruitment by terrorist organizations, especially via encrypted social networks. A number of attacks were reportedly perpetrated by lone wolves, people who are not directly recruited by terrorist groups but merely inspired by online jihadist propaganda.