French police issue picture of Stade de France jihadist who blew himself to pieces as they try to identify him

French police have issued a new appeal to identify the third man believed to have helped carry out the bombings at the Stade de France.

National Police today posted a photo of the man on Twitter, appealing to the public for information that would help identify him.

He was among three people who died in the attacks outside the stadium, and is believed to have entered Europe as an asylum-seeking migrant.

The release of his image comes as Belgian Interior Minister Jan Jambon today said '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.

Armed soldiers and police flooded the streets Brussels, which was locked down for a second day following reports of an 'imminent' Paris-style terror attack.

Camouflaged soldiers continued to patrol the streets as the manhunt for Abdeslam, 26, and 'several' other terror suspects, was stepped up.

The metro station was closed down and shops were shut as locals were warned to avoid large crowds.

Abdeslam, who has been described as 'armed and dangerous' went on the run after taking part in the massacre of 130 in Paris last Friday.

His brother Mohamed, who was arrested following the attacks only to be released without charge, believes he backed out of the attack 'at the very last moment'.

But Jambon said the threat facing Brussels wouldn't necessarily disappear if Abdeslam was found, because 'unfortunately, the threat is wider than this [one] figure.

This evening authorities decided to keep the Belgian capital on the highest state of alert into tomorrow because of the 'serious and imminent' threat of a Paris-style attack, the prime minister said.

The latest measures go far beyond those taken the last time Brussels was put on level four alert, for about a month at the end of 2007 and the start of 2008, when authorities intercepted a plot to free convicted Tunisian Nizar Trabelsi from a Belgian jail.

Schools and universities in Brussels will be closed, and the city's subway will remain shut down, government officials decided at a meeting tonight of the country's National Security Council.

With Abdeslam last seen crossing into Belgium, officials in Brussels kept much of the city shut down during the weekend.

Officials also recommended that sports competitions and all activities in public buildings be cancelled, and malls and commercial centers closed.

'We fear an attack like in Paris, with several individuals, perhaps in several places,' said Prime Minister Charles Michel, who chaired the meeting. Brussels was put on Level 4, the highest state of alert, while the rest of Belgium was on Level 3.

Meanwhile Mr Jambon said several suspects tied to the Paris attacks were thought to be at large and that the threat wouldn't necessarily disappear if Salah Abdeslam - who is believed to have played a key role in the attacks - was found.

Weekend measures have included shutting down Brussels' subway system and canceling public activities. They have created an eerie calm in the heart of the city, which is usually bustling with tourists and residents.

Upon entering the security council meeting on Sunday evening, Belgian Vice President Kris Peeters said 'we have to make decisions to avoid that Brussels will be an empty city.'

Western leaders stepped up the rhetoric against the Islamic State group, which has claimed responsibility for the attacks in Paris that killed 130 people and wounded hundreds more; the suicide bombings in Beirut that killed 43 people and injured more than 200; and the downing of the Russian airline carrying 224 people in Sinai. All occurred within the past month.

Speaking from Kuala Lumpur, U.S. President Barack Obama said the world would not accept the extremists' attacks on civilians as the 'new normal,' and vowed the U.S. and its international partners would not relent in the fight against the Islamic militants.

French Defense Minister Jean-Yves Le Drian said ISIS must be destroyed at all costs.

'We must annihilate Islamic State worldwide... and we must destroy Islamic State on its own territory. That's the only possible direction.'