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Paris — French police hunted Tuesday for a second terrorist believed to have escaped after the bomb and gun massacres in Paris, while a U.S. official revealed that the suspected mastermind was part of an Islamic State cell that American intelligence agencies had been tracking for months.

Meanwhile, France and Russia unleashed a new wave of airstrikes against Islamic State targets in Syria Tuesday, while fears of further terror attacks deepened in Paris and beyond. The Eiffel Tower closed to the public just a day after it had reopened and a soccer match between Germany and the Netherlands was canceled due to a bomb threat just 90 minutes before kickoff.

Islamic State militants have claimed responsibility for the Friday the 13th attacks that targeted France’s national soccer stadium, a packed concert hall and popular restaurants and cafes in one of Paris’ trendiest neighborhoods, killing 129 people and wounding more than 350.

French authorities had previously said that at least eight people were directly involved in the bloodshed Friday: seven who died in the attacks and one who got away and slipped across the border to Belgium. However, there have been gaps in officials’ public statements, which have never fully disclosed how many attackers took part in the deadly rampage.

On Tuesday, officials told the Associated Press they now believe at least one other attacker was involved and they were working to identify and track down that suspect. Three officials spoke on condition of anonymity because they were not authorized to provide details about the ongoing investigation.

Surveillance video obtained by the AP also indicated that a team of three attackers carried out the shootings at one of the cafes. The video was among evidence authorities used in concluding that at least one other attacker was at large, the French officials indicated.

The brief clip shows two black-clad gunmen with automatic weapons calmly firing on the bar then returning toward a waiting car, whose driver was maneuvering behind them. Authorities believe the car is the same black SEAT-make vehicle that was found Saturday with three Kalashnikovs inside.

Previously officials had not specified how many people were involved in the attack on a sidewalk bar on La Fontaine au Roi street, as well as the other night spots in the same vicinity.

Investigators have identified 27-year-old Abdelhamid Abaaoud, a Belgian of Moroccan descent, as the chief architect of the attacks. He is believed to be in Islamic State-held territory in Syria.

A U.S. official briefed on intelligence matters said Abaaoud was a key figure in an Islamic State external operations cell that U.S. intelligence agencies have been tracking for many months.

Analysts have been debating to what extent the Islamic State group was devoting resources to external terrorist attacks, versus seeking to hold onto the territory it has seized in Iraq and Syria. A consensus is now emerging that the group is more focused on exporting terror than had been widely understood.

U.S. intelligence agencies have some insights into who is involved in that effort, said the official, who was not authorized to discuss the matter publicly and spoke on condition of anonymity. But their understanding is hampered by the many challenges of gathering intelligence in Syria, where the CIA does not have a regular presence on the ground.

The chairman of the Senate intelligence committee said Tuesday that it was likely militants plotting the attacks in Syria, Belgium and France used encryption to hide their communications from authorities. Sen. Richard Burr, R-North Carolina, said there was no direct evidence of encryption, but that authorities had concluded it was used because they have uncovered no evidence of conversations among the plotters.

The statement acknowledges the challenges intelligence agencies face in monitoring records of international phone traffic.

Speaking to reporters after a classified intelligence briefing, Burr also said there is a “strong likelihood” the Paris attacks were directed, rather than just inspired, by the Islamic State group in Syria.

The comments were the strongest public attribution yet by American officials. CIA director John Brennan said Monday the attack bore “the hallmarks of terrorism carried out” by the Islamic State group.

The U.S. Joint Special Operations Command has been carrying out targeted strikes for about a year against senior Islamic State militants in Syria, in cooperation with the CIA and other agencies.

On Tuesday, 10 French fighter jets attacked Islamic State targets in Syria in a new wave of airstrikes, French Defense Minister Jean-Yves Le Drian said. Speaking on TF1 TV, he said France will have 36 warplanes in the region capable of carrying out airstrikes on Islamic State targets once the Charles de Gaulle aircraft carrier reaches the zone.

NATO allies were sharing intelligence and working closely with France, NATO chief Jens Stoltenberg said.

In Moscow, Russian President Vladimir Putin ordered the missile cruiser Moskva, currently in the Mediterranean, to start cooperating with the French military on operations in Syria. His order came as Russian warplanes fired cruise missiles on militant positions in Syria.

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