Story highlights The FBI plans closer monitoring of suspected ISIS sympathizers

There's no indication of actual plots in the U.S.

(CNN) The FBI plans closer monitoring of suspected ISIS sympathizers, including more wiretaps, as a way to guard against potential threats in the U.S., after the Paris attacks, two U.S. law enforcement officials told CNN.

Senior FBI officials convened secure conference calls over the weekend with law enforcement around the nation to describe steps being taken in the aftermath of the Paris attacks.

Photos: Increased security following Paris attacks Photos: Increased security following Paris attacks People go through a security checkpoint to attend a Mass in homage to victims of the Paris terror attacks at Notre Dame cathedral in Paris on Sunday, November 15. French President Francois Hollande declared a state of emergency after the attacks in Paris on Friday, November 13, and said border security has been ramped up. The terrorist group ISIS claimed responsibility for the attacks. Hide Caption 1 of 13 Photos: Increased security following Paris attacks French Prime Minister Manuel Valls, center, speaks with police forces with French Interior minister Bernard Cazeneuve, left, and Defence Minister Jean-Yves Le Drian at the Gare du Nord railway station in Paris on November 15 about security measures after the attacks. Hide Caption 2 of 13 Photos: Increased security following Paris attacks French police secure the perimeter after panic broke out among mourners who paid their respects at the attack sites at restaurant Le Petit Cambodge and the Carillon Hotel in Paris on November 15. Hide Caption 3 of 13 Photos: Increased security following Paris attacks Mounted police officers patrol in front of the Eiffel Tower in Paris on November 15. Hide Caption 4 of 13 Photos: Increased security following Paris attacks Security personnel inspect vehicles at the border between Belgium and France on Saturday, November 14. Hide Caption 5 of 13 Photos: Increased security following Paris attacks A police officer stands guard outside the Cafe Bonne Biere in the Rue de la Fontaine au Roi in Paris on November 14. Hide Caption 6 of 13 Photos: Increased security following Paris attacks A French police officer guards the French-Italian border on November 14 in Menton, France. Hide Caption 7 of 13 Photos: Increased security following Paris attacks Soldiers from the 3rd Marine Infantry Parachute Regiment of Carcassonne arrive at Charles de Gaulle Airport in Paris as security reinforcements on November 14. Hide Caption 8 of 13 Photos: Increased security following Paris attacks Soldiers patrol the Eiffel Tower on November 14. Hide Caption 9 of 13 Photos: Increased security following Paris attacks French police check vehicles on the bridge between Strasbourg and Kehl, Germany, on November 14. Hide Caption 10 of 13 Photos: Increased security following Paris attacks Police vehicles are parked near the entrance to the Louvre in Paris on November 14. Interior Minister Bernard Cazeneuve said the state of emergency in France could mean restrictions on people's movements. Airports in France remained open, and airlines were still flying there, though some airlines reported canceled flights. Hide Caption 11 of 13 Photos: Increased security following Paris attacks French police check vehicles on the so-called European bridge between Strasbourg and Kehl, Germany, on November 14. Hide Caption 12 of 13 Photos: Increased security following Paris attacks Police stand guard at a train station in Paris on November 14. Hide Caption 13 of 13

There's no indication of actual plots in the U.S., so these steps are precautionary, the officials said. These are similar to steps taken after the May ISIS-inspired attack in Garland, Texas.

The officials said that agents who are overseeing investigations of known ISIS supporters have these instructions: first, know where they are, then determine if there's new information that merit making the investigative subject a higher priority. Some subjects will get increased monitoring and that will include additional wiretaps.

The steps are being taken in part because of the way the Paris suspects were able to evade notice of French intelligence.

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