Multiple ISIS plots being planned in Europe

A combination of electronic intercepts, human sources and database tracking indicates several possible targets had been picked out by the ISIS operatives over the last few months since the Paris attacks, according to U.S. counterterrorism officials.

Since the attacks earlier this week, information found in a raided apartment, including maps, indicated other potential targets had been chosen, one of the sources said.

Raids in northwest Paris foiled a planned attack as two suspects in the deadly Brussels bombings remain on the loose.

The plot was at the “advanced stage” of preparation and was discovered after a French national — described as being at a “high level” in the plot — was arrested this morning, according to Interior Minister Bernard Cazeneuve.

Officials fear there are dozens of potential and known ISIS operatives still in Europe they’re concerned about and some of them may overlap with the Paris and Brussels attackers. One of the sources says plots haven’t been disrupted either because the information about the plots is too fragmentary or because investigators are trying to gather more intelligence. The source also stressed that the situation with the plots is very fluid and can change very quickly depending on the opportunity for the operatives some of whom have been trained by ISIS in Syria and Iraq.