With a menace of Paris-style attacks against Brussels and a missing suspect in the deadly November 13 attacks in France last spotted crossing into Belgium, the city kept subways and underground trams closed for a second day.
Officials also recommended that sports competitions and all activities in public buildings be cancelled and malls and commercial centres closed.
Western leaders, meanwhile, vowed to stand up to IS, 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 happened within the past month.
French Defense Minister Jean-Yves Le Drian said IS must be destroyed at all costs.
"We must annihilate Islamic State worldwide ... And we must destroy Islamic State on its own territory," Le Drian said, speaking this morning news shows. "That's the only possible direction."
France has intensified its aerial bombing in Syria and Le Drian said French aircraft carrier Charles de Gaulle, which has been sent to help operations against IS militants in Syria, will be "operational" from tomorrow and "ready to act."
Cameron is expected to outline his plan for combating the Islamic militants this week as he seeks Parliamentary approval to join France, the United States and Russia in striking the group's strongholds in Syria.
Tensions have been high in Europe since the attacks in Paris. France has extended a state of emergency which allows police raids, searches and house arrest without permission from a judge for three months, and yesterday extended a ban on demonstrations and other gatherings through November 30, when a UN climate conference with more than 100 heads of state is scheduled to start.
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