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NEW: Belgian police release five arrested in Paris terror investigation

No guns or explosives were found at the arrest locations

Authorities are still hunting for Salah Abdeslam, a key suspect in Paris attacks

CNN  — 

Police in Belgium have released five people arrested in their investigation into last month’s Paris terror attacks, the Belgian federal prosecutor’s office announced Monday.

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. It’s unclear why they were arrested or released.

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.

ISIS has claimed responsibility for the attacks, and in response, French President Francois Hollande declared that the country was at war with the terror group, which commands large stretches of territory in Syria and Iraq.

Worldwide manhunt

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.

Last week, Belgium Justice Minister Koen Geens revealed that Belgian police had waited hours to search a house for Abdeslam because of a law that prevented such searches between 9 p.m. and 5 a.m.

By the time Belgian authorities searched a house in the Brussels suburb of Molenbeek days after the attacks, the Belgium-born French national was not present, he said.

Belgium changed the law December 11 to allow house searches 24 hours a day in terrorism investigations.

Authorities had already missed one chance to capture Abdeslam, who was driving toward the Belgian border when police stopped and questioned him a few hours after the attacks. He was not detained, and the car was found in Molenbeek, where his family lives.

Intelligence officials have said they suspect he may be trying to escape to Syria.

CNN’s Drew Griffin contributed to this report.