Investigators were studying mobile phones and computer equipment seized in a total of nine raids across Brussels.

Belgian police on Tuesday arrested 10 people in the Brussels area allegedly part of a network recruiting people to fight with ISIS in Syria, prosecutors said.

The 10 were arrested during raids in Molenbeek and others areas of the Belgian capital but the case is not linked to the deadly November Paris attacks, the federal prosecutor’s office said in a statement.

Several of those involved in the Paris killings came from Molenbeek.

“The raids were carried out as part of an investigation into a recruitment network linked to Islamic State. The investigation helped determine that several people had travelled to Syria to join Islamic State,” it said referring to ISIS by another name.

The raids were ordered by a counter-terrorism judge in the eastern city of Liege who will decide later in the day whether to continue holding them, the statement said.

Investigators were studying mobile phones and computer equipment seized in a total of nine raids across Brussels.

Belgium has produced more militant fighters relative to its population than any other country in Europe, with some 500 believed to have gone to fight in the Middle East.

Many have joined ISIS which claimed the November attacks on the French capital.

Belgian police are holding several people in connection with the Nov. 13 attacks in Paris which left 130 people dead and hundreds wounded as it emerges that the onslaught was largely organized and coordinated from Belgium.

Earlier this month, the authorities identified three safe houses used by key Paris suspects – in Brussels, in Charleroi, an hour’s drive south of the capital, and in Auvelais, a village near the French border.

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