Police and forensic officers work during a house search in the Molenbeek district of Brussels on Wednesday, June 21, 2017. Belgian authorities said they foiled a "terror attack" when soldiers shot a suspect in the heart of Brussels after a small explosion at a busy train station Tuesday on a night that continued a week of attacks in the capitals of Europe. (AP Photo/Francois Walschaerts)

Police and forensic officers work during a house search in the Molenbeek district of Brussels on Wednesday, June 21, 2017. Belgian authorities said they foiled a "terror attack" when soldiers shot a suspect in the heart of Brussels after a small explosion at a busy train station Tuesday on a night that continued a week of attacks in the capitals of Europe. (AP Photo/Francois Walschaerts)

BRUSSELS (AP) — Belgian authorities said Thursday that police detained four people in a series of raids in Brussels linked to the failed bombing at a rail station this week by a man shouting “Allahu akbar.”

The federal prosecutor’s office said that the four were picked up during searches in the Molenbeek neighborhood, as well as in Anderlecht and Koekelberg. The attacker in Tuesday’s violence at Brussels Central Station was a 36-year-old Moroccan national also living in Molenbeek, but he wasn’t known to authorities for being involved in extremist activities.

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Many of the suspects linked to attacks in Brussels and in Paris in November 2015 lived in or passed through the Molenbeek neighborhood

Prosecutors said in a statement that the four suspects allegedly linked to the latest incident in Brussels were “taken in for thorough questioning” and that an investigating judge would decide later Thursday whether to keep them in custody. Authorities didn’t say whether anything had been seized in the raids, and declined to provide further details.

The raids are among several launched since Tuesday’s attempted attack at Brussels Central Station in which the man blew up a device that didn’t fully detonate. He was then fatally shot by soldiers after charging at them while shouting “Allahu akbar,” the Arabic phrase for “God is great.” No one else was hurt.

Belgium has been on high alert since suicide bombers killed 32 people at the Brussels airport and a subway station last year.

Authorities said the quick shooting of the attacker averted fatalities. He had been trying to detonate a larger nail bomb.

“It was clear he wanted to cause much more damage than what happened,” federal prosecutor Eric Van der Sypt said Wednesday. “The bag exploded twice, but it could have been a lot worse.”