Bullet holes in the window of a restaurant targeted in Paris attack
Bullet holes in the window of a restaurant targeted in Paris attackReuters

Police in Belgium on Monday released five people who were arrested as part of the investigation into last month's Paris terror attacks, CNN reported.

Police arrested two brothers and a third person Sunday in Brussels based on phone records, the prosecutor's office said.

Two more people were arrested Monday morning in Laeken. Police said no guns or explosives were found in either case. All five were released Monday, the prosecutor's office said, according to CNN.

It remains unclear why they were arrested or released.

Belgian police have conducted several raids in the country, particularly in the Molenbeek district of Brussels where the terrorists are believed to have come from, following the Paris attacks.

Belgium's security services were on the defensive after the attacks when they were accused of blunders, infighting and worrying leniency towards radicalism that let the perpetrators of the Paris attacks slip under the radar.

The November 13 terror attacks in Paris killed 130 people and wounded hundreds. The attackers, armed with assault rifles and explosives, attacked six locations across the city, targeting a stadium, a concert hall and restaurants and bars.

A worldwide search is underway for key suspect Salah Abdeslam, 26, who is thought to have been the driver of a black Renault Clio that dropped off three suicide bombers near the Stade de France the night of November 13.

Belgian police failed to locate Abdeslam in the raids after the Paris attacks, and it is believed he was successful in fleeing to Germany.

Previously, senior officials in Hungary said Abdeslam traveled to Budapest before the Paris attacks where he "recruited a team" from unregistered migrants passing through.