Belgian police patrol a platform at the Midi/Zuid railway station in Brussels on Jan. 7. (Francois Lenoir/Reuters)

Belgian authorities have searched a Brussels apartment that may have been a site for making bombs and also used as a hideout by one of the fugitive suspects in the Paris attacks, a statement said Friday.

Belgian federal prosecutors said that police raided the apartment in the Schaerbeek district on Dec. 10.

It was unclear why officials waited a month to disclose the latest details from the probe into the Nov. 13 attacks in Paris, which killed 130 people. Two of the attackers had apparently been living in Brussels, and Belgian authorities have arrested 10 people, including one who rented the Schaerbeek apartment, Reuters reported.

In the apartment raid, police found a fingerprint of Salah Abdeslam, 26, the brother of one of the attackers. He returned from Paris shortly after the attacks and remains at large.

Police believe Abdeslam, a French national born in Brussels, took part in the attacks, but his exact role remains unclear.

The prosecutor’s office said the raid also turned up traces of the explosive TATP and three handmade belts that could be used to transport explosives.

The suspected ringleader of the attacks was Belgian national Abdelhamid Abaaoud. He and his female cousin, Hasna Aitboulahcen, died in a gun battle in a Paris suburb five days after the attacks, when police raided the apartment in which they were hiding.

Many of those arrested in Belgium have links to Abdeslam, including two who drove from Brussels hours after the attacks to pick him up and another who drove him from one part of Brussels to Schaerbeek after his return, Reuters reported.

Read more:

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What we know about the Paris attacks

How officials may have missed their chance to stop Paris terror suspects

Today’s coverage from Post correspondents around the world