Brussels (AFP) - Belgian police have launched several operations linked to the "terrorist threat" facing Brussels, which is under a top security alert over fears of Paris-style attacks, a spokesman said Sunday.

"Different operations are under way because of the terrorist threat," a police spokesman told AFP, requesting that "the media do not comment directly on the actions under way, mentioning the places for example". The public prosecutor will hold a news conference "when it is all over", he added.