Police armed with automatic weapons guarded schools in the Belgian capital Wednesday as they reopened for the first time since emergency measures were imposed in the wake of the Paris attacks. Meanwhile, Belgian and French authorities continued a hunt for at least two suspects believed directly linked to the killings.

Belgian soldiers guard at the Shuman metro station in Brussels, capital of Belgium, Nov. 25, 2015. [Photo/Xinhua]

Brussels' subway system also began reopening after a four-day shutdown, with about half of its stations operational. Despite the easing of restrictions, the city remains under the highest threat alert level due to what authorities have described as a serious and imminent threat of attack. Emergency measures imposed since Saturday had shut down shops, schools and subways.

The threat alert level is to remain in place until at least Monday barring significant developments such as the arrest of suspects linked to the Paris attacks.

The Belgian government has ordered health and emergency services to take precautionary measures to ensure their services aren't infiltrated by extremists.

"We have to be sure that we can see everybody has an identification badge," Health Minister Maggie De Block told VRT network. "When ambulances arrive, we have to see from where they come, who is in it. Really as a precaution."

Belgian Interior Minister Jan Jambon said raids carried out on Sunday night had been designed to foil an imminent attack in Brussels. Authorities had detained 16 people during the raid, but released all but one of them the following day. No explosives or firearms were seized.

"Indeed, there were indications that there would be attacks on Sunday evening and they did not materialize," Jambon said. Otherwise, he said, "you don't impose terror level 4," the highest possible. The minister refused to elaborate what kind of attacks the government believed had been planned.

The reopening of schools and some subway stations is restoring a sense of normality to Brussels, parts of which have been deserted since the alert was first raised.

At Brussels' College Saint-Jean-Berchmans, some parents gave their children a quick kiss before dropping them off, while several police officers guarded the entrance, including at least one with a machine gun. Among the students at the school is Belgium's Princess Eleonore.

Some children looked worried as they arrived at the upscale school, but most gave a friendly handshake to a burly school official guarding the entrance alongside the police officers.

"I'm concerned, but I think that life must go on," said Dimitri De Cra Yencour, a father of four. "Even if something happens in Paris or in Brussels, they have to go back to school," he said.

French and Belgian authorities have issued public appeals for help in tracking down two men believed directly linked to the Paris attacks that killed 130 people and wounded hundreds in shootings and suicide bombings.

On Tuesday, Belgium issued an international arrest warrant for Mohamed Abrini, described as "armed and dangerous" after he was seen with Salah Abdeslam, the other fugitive suspect, two days before the killings on a highway gas station on the way to Paris.

Abrini and Abdeslam were picked up on the surveillance video of a gas station in Ressons. Abdeslam, who French authorities have suggested could have been linked to a discarded suicide vest found in a southern Paris neighborhood on Monday, crossed into Belgium the day after the attacks.

One of Abdeslam's brothers, Brahim, was the suicide bomber who blew himself up outside a Paris cafe during the attacks. His other brother, Mohamed, appealed on French media yesterday for the fugitive to surrender to police.

Emergency measures have also been taken in France while the manhunt continues.

UN climate talks open in Paris on Monday, with about 140 world leaders expected to attend. French Interior Minister Bernard Cazeneuve said tight security would be imposed.

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