French police have made several arrests since a man went on a stabbing rampage, killing one and wounding several others in what President Emmanuel Macron called an "Islamist terrorist act", anti-terror prosecutors told AFP Sunday.

A deadly stabbing in Mulhouse, eastern France, linked to Islamic extremism, resulted in the death of a Portuguese man and injuries to seven police officers. The suspect, a 37-year-old Algerian, was detained along with three others.

As he began his attack, the 37-year-old was heard shouting, “Allahu akbar,” according to France’s antiterrorism police. The Arabic phrase, meaning “God is great,” is an everyday expression used in religious and nonreligious settings alike, but has also become a war cry in some terrorist attacks by Islamic fundamentalists.