Belgian authorities have charged a fifth suspect with terror offences relating to the Paris attacks.

The federal prosecutor's office on Tuesday also issued an international warrant for Mohamed Abrini, who is being tracked by both Belgian and French police.

Authorities are looking for Abrini because he was seen with fugitive Salah Abdeslam at a gasoline station in Ressons on the highway to Paris two days before the attacks. They said that Abrini was driving the Renault Clio that was used in the attacks in Paris on Nov. 13 that killed 130 people and wounded hundreds of others.

Meanwhile, French authorities on Tuesday questioned a top suspect linked to attackers who terrorized Paris.

Jawad Bendaoud, the only person in France facing potential terrorism charges linked to the Nov. 13 Paris attacks that killed 130 people and wounded hundreds, was handed over Tuesday morning to an anti-terrorism judge in Paris, according to a judicial official.

Bendaoud was detained last week for providing lodging to the suspected mastermind of the attacks in an apartment in the Paris suburb of Saint-Denis.

Police raided the apartment Nov. 18, and three people were killed — including suspected attacks orchestrator Abdelhamid Abaaoud, a female cousin and one other. Bendaoud acknowledged in a television interview giving shelter to two people from Belgium but said he didn't know who they were or what they planned. Bendaoud, 29, told BFM television, "I didn't know they were terrorists. I was asked to do a favour. I did a favour, sir."

He must be either charged or released Tuesday.

Four people have been handed terrorism charges in Belgium since the Paris attacks, which have been traced to a network of people with ties to both France and Belgium.

Brussels remained at its highest alert level Tuesday, after Belgian Prime Minister Charles Michel cited a "serious and imminent threat" to the city, which houses the headquarters of the European Union and NATO. Belgium's crisis centre said the alert level would only change if a significant breakthrough warranted it.

Increased security measures in the wake of the massacre in Paris have virtually shut down the Belgian capital, with the subway system, many shops and schools remaining shut. Michel said that despite the continued high alert, schools would reopen on Wednesday.

Belgium police officers patrol the Grand Place in central Brussels on Tuesday. An ongoing lockdown has closed the capital's subways and schools. Officials have recommended that popular shopping districts be shuttered and advised people to avoid public places since they could be targeted by terrorists. (Michael Probst/Associated Press)

Businesses in Brussels were starting to feel the pain, and while few question the government's need to protect the public from a potential attack, some shop owners said the shutdown was too extreme.

"It's not a very good decision," said Esther Willems, assistant manager at the Galler chocolate shop in the heart of Brussels' city centre. "In the last two days, we have only had about 10-11 clients" compared with about 100 normally. Willems said she hoped things would improve Wednesday.

Many questions remain unanswered as investigators try to piece together what happened in Paris on the night of Nov. 13 and who might still be at large.

Only one fugitive has been publicly named: Salah Abdeslam, who crossed into Belgium the morning after the attacks.

Explosive vest found

A street cleaner in a Paris suburb found an explosive vest Monday near the place where Abdeslam's cellphone was found, raising the possibility that he aborted his mission, either ditching a malfunctioning vest or fleeing in fear.

Authorities said the device, which did not have a detonator, was found in the southern Paris suburb of Montrouge. A police official said the vest contained bolts and the same type of explosive used in the Nov. 13 attacks.

France's security chiefs held a meeting Tuesday about protection for next year's European soccer championships, being hosted in cities around France. Concerns are especially high because one of the targets of the Nov. 13 attacks was the country's national stadium.

Interior Minister Bernard Cazeneuve also held a meeting with French Muslim leaders, who have denounced the attacks and expressed concern about a backlash on France's largely moderate, 5-million-strong Muslim community.