Brussels: Belgian Interior Minister Jan Jambon says "several suspects" tied to the Paris attacks could be at large in the country.
Jambon told Flemish broadcaster VRT this is why Belgium has put so many security resources in place in the past few days.
Authorities have previously said Salah Abdeslam, who is suspected of playing a key role in the attacks, is believed to have crossed into Belgium.
But Jambon said Sunday that the threat facing Brussels wouldn't necessarily disappear if Abdeslam was found, because "unfortunately, the threat is wider than this (one) figure."
The mayor of one of Brussels' many municipalities has told Belgian media that the capital is still facing a grave threat, according to the prime minister.
Schaerbeek Mayor Bernard Clerfayt said Sunday: "There are two terrorists in the Brussels region that could commit very dangerous acts."
One of the suspected Paris attackers, Salah Abdeslam, is at large and is known to have crossed into Belgium the morning after the Nov. 13 attacks. The source of the mayor's information about a second suspect wasn't immediately clear and the prime minister's office declined to comment.
Belgium's national Crisis Center on Saturday raised the threat alert in the Brussels region to Level 4, which indicates a "serious and immediate threat."
Clerfayt said it was necessary to try to anticipate and prevent any such acts and their consequences.
He said: "As long as this threat is present, we must be very attentive."
Meanwhile the brother of Salah Abdeslam, who is thought to have played a key role in the Paris attacks and is believed to be on the run in Belgium, has appealed to him to turn himself in.
Mohamed Abdeslam told Belgian broadcaster RTBF Sunday he would rather see his "brother in prison than in a cemetery."
Mohamed's other brother, Brahim, was one of the suicide bombers in the Nov. 13 Paris attacks that killed 130 people.
He said he had noticed a change in his brothers' behavior about six months ago, when they gave up drinking and began going to the mosque occasionally, but said there was never any sign of radicalization.
He said he was convinced his brothers were manipulated, adding he hoped that Salah had a change of heart before the Paris attacks happened and that he wasn't actually involved.
Asked if he had a message for his brother, he said: "Surrender."