An anonymous caller warned a newspaper some 30 minutes earlier, a police official said on condition of anonymity.
An anonymous caller warned a newspaper some 30 minutes earlier, a police official said on condition of anonymity.
Hollande said Britain and France had a "joint obligation" to strike at the militant group.
The Belgian government kept the capital on the highest state of alert in the face of what it described as a "serious and imminent" threat.
The filtering by Balkan countries trap growing number of Iranians, Pakistanis, Bangladeshis and other nationalities from Asia and Africa as temperatures drop.
French Defence Minister Jean-Yves Le Drian said a chemical or biological attack "was among the risks" faced.
British newspapers reported a vote could be held within the next two weeks, with bombing underway by Christmas.
This weekend, Harrods celebrates the start of the festive season by revealing its theme for 2015: 'Once Upon a Christmas'.
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."
Halifax Stanfield International Airport said on its Twitter feed early Sunday that Flight 2 had landed safely and that police were at the scene.
Jesse Hughes of the band Eagles of Death Metal spoke to Vice in an interview that airs on its website next week.