The perpetrator is apparently “Iranian and in his 30s.”
Possibly related, despite the Shia/Sunni divide, is the fact that the Islamic State issued this call in September 2014:
So O muwahhid, do not let this battle pass you by wherever you may be. You must strike the soldiers, patrons, and troops of the tawaghit. Strike their police, security, and intelligence members, as well as their treacherous agents. Destroy their beds. Embitter their lives for them and busy them with themselves. If you can kill a disbelieving American or European — especially the spiteful and filthy French — or an Australian, or a Canadian, or any other disbeliever from the disbelievers waging war, including the citizens of the countries that entered into a coalition against the Islamic State, then rely upon Allah, and kill him in any manner or way however it may be….If you are not able to find an IED or a bullet, then single out the disbelieving American, Frenchman, or any of their allies. Smash his head with a rock, or slaughter him with a knife, or run him over with your car, or throw him down from a high place, or choke him, or poison him….
“Germany Lubeck bus attack: Knifeman injures 14 victims ‘after dropping smoking backpack’,” Mirror, July 20, 2018 (thanks to Lookmann):
At least 14 people have been injured after a ‘mass stabbing’ on a bus in Lubeck, Germany.
A passenger is said to have dropped a backpack which reportedly started smoking, according to local media – as others on board the packed bus started screaming and trying to jump off.
The assailant is said to have been armed with a kitchen knife – although some local media are reporting the existence of a gun, yet to be confirmed.
He was overpowered by police at the scene and is under arrest, according to local police.
Eyewitnesses say the bus was full when one male passenger dropped a backpack which started ‘smouldering’, LN online report.
The man then reportedly pulled a gun and attacked those on the bus, it said.
The bus driver stopped the vehicle immediately and opened the doors for passengers to flee, before he too was allegedly attacked.
Police were at the scene within minutes of the first emergency calls being made and claim the man is of Iranian and in his 30s.
While early reports claimed one man has been killed later reports suggest there have been no deaths….