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….

But there’s nothing to be concerned about. “The suspect appeared to be a ‘confused man.'” Of course. What else could he possibly be?

“Moment police officers fire warning shot at a knifeman after he ‘shouted Allahu Akbar’ before wrestling him to the ground in Holland,” by Gareth Davies, Mailonline, November 23, 2017:

This is the moment police officers fired a warning shot at a knifeman who allegedly shouted Allahu Akbar after threatening several passers-by. The tense situation started yesterday morning in Urk, a traditional fishing town in the heart of the Netherlands, when he entered a petrol station at around 8.30am looking confused. He then ran outside and threatened passers-by whilst shouting the Arabic phrase which translates to ‘God is greatest’, according to witnesses. The petrol station employee said the man was looking ‘more confused than actually dangerous,’ adding he wasn’t waving a weapon inside the building. Outside the petrol station, the man pulled out a knife which he started to wave around, threatening passers-by. According to media reports, he sang songs containing the words ‘Allahu Akbar’, Arabic for ‘God is greatest’.

In reality, it means “Allah is greater,” i.e., greater than your god.