Paris attacks: France hunts 2nd fugitive, hits ISIS strongholds in Syria

French police are hunting for a second fugitive directly involved in the deadly Paris attacks, officials said Tuesday after France made an unprecedented demand that its European Union allies support its military action against the Islamic State group.

The disclosure of a second possible fugitive came on the same day that France launched new airstrikes on the militants' stronghold in Syria; as Vladimir Putin ordered a Russian military cruiser to co-operate with French on fighting ISIS in Syria and as U.S. Secretary of State John Kerry hinted at a possible upcoming cease-fire in Syria that would let nations focus on fighting IS.

French and Belgian police were already looking for key suspect Salah Abdeslam, 26, whose suicide-bomber brother Brahim died in the attacks Friday night that killed at least 129 people and left more than 350 wounded in Paris. Islamic State militants have claimed responsibility for the carnage.

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Seven attackers died that night three around the national stadium, three inside the Bataclan concert hall, and one at a restaurant nearby. A team of gunmen also opened fire at nightspots in one of Paris's trendiest neighbourhoods.

However, three French officials told The Associated Press on Tuesday that an analysis of the attacks showed that one person directly involved in them was unaccounted for. The officials, who spoke on condition of anonymity because they were not authorized to provide details about the current investigation, said the second fugitive has not been identified.

The Paris attacks have galvanized international determination to confront the militants.

The French government invoked a never-before-used article of the EU's Lisbon Treaty obliging members of the 28-nation bloc to give "aid and assistance by all the means in their power" to a member country that is "the victim of armed aggression on its territory."

French Defence Minister Jean-Yves Le Drian said all 27 of France's EU partners responded positively.

"Every country said 'I am going to assist, I am going to help,'" Drian said.

Arriving for talks in Brussels, Greek Defence Minister Panagiotis Kammenos told reporters that the Paris attacks were a game-changer for the bloc. "This is Sept. 11 for Europe," he said.

Paris police said 16 people had been arrested in the region in relation to the deadly attacks, and police have carried out 104 raids since a state of emergency was declared Saturday.

French military spokesman Col. Gilles Jaron said the latest airstrikes in the Islamic State group's de-facto capital in the Syrian city of Raqqa destroyed a command post and training camp. NATO allies were sharing intelligence and working closely with France, NATO chief Jens Stoltenberg said.

In Moscow, Putin ordered the Russian missile cruiser Moskva, currently in the Mediterranean, to start co-operating with the French military on operations in Syria. His order came as Russia's defence minister said its warplanes fired cruise missiles on militant positions in Syria's Idlib and Aleppo provinces. ISIS has positions in Aleppo province, while the Nusra militant group is in Idlib.

Moscow has vowed to hunt down those responsible for blowing up a Russian passenger plane over Egypt last month, killing 224 people, mostly Russian tourists. ISIS has also claimed responsibility for that Oct. 31 attack.

Seven of the Paris attackers died Friday six after detonating suicide belts and a seventh from police gunfire but Iraqi intelligence officials told The Associated Press that their sources indicated 19 people had participated in the Paris attacks and five others had provided hands-on logistical support.

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Mohamed Abdeslam, another brother of fugitive Salah Abdeslam, on Tuesday urged his brother to turn himself in. Mohamed, who was arrested and questioned following the attack before being released Monday, told French TV BFM that his brother was devout but showed no signs of being a radical Islamist. He said Salah prayed and attended a mosque occasionally, but also dressed in jeans and pullovers.

In another development, two men arrested in Belgium, admitted driving to France to pick up Salah Abdeslam early Saturday, their lawyers said.

Mohammed Amri, 27, denies any involvement in the Paris attacks and says he went to Paris to collect his friend Salah, according to his defence lawyer Xavier Carrette. Hamza Attou, 21, says he went along to keep Amri company, his lawyer Carine Couquelet said. Both are being held on charges of terrorist murder and conspiracy.

Belgian media reported that Amri and Attou were being investigated as potential suppliers of the suicide bombs used in the attacks, since ammonium nitrate, a fertilizer that can be used to make explosives, was discovered in a search of their residence.

Their defence lawyers said they could not confirm those reports.

Salah and Brahim Abdeslam booked a hotel in the southeastern Paris suburb of Alfortville and rented a house in the northeastern suburb of Bobigny several days before the attacks, a French judicial official told The Associated Press. She spoke on condition of anonymity because she was not authorized to speak about the ongoing investigation.

Austria's Interior Ministry said Salah Abdeslam, the suspected driver of one group of gunmen carrying out attacks on Paris, entered the country about two months ago with two companions that were not identified. After the attacks, Salah Abdeslam slipped through France's fingers, with French police accidentally permitting him to cross into Belgium on Saturday.

Kerry flew to France as a gesture of solidarity and met French President FranoisHollande and Foreign Minister Laurent Fabius on Tuesday.

A cease-fire between Syria's government and the opposition which would allow nations supporting Syria's various factions to focus more on ISIS could be just weeks away, Kerry said, describing it as potentially a "gigantic step" toward deeper international co-operation.

Standing next to Hollande at the Elyse Palace, Kerry said the carnage in the French capital, along with recent attacks in Egypt, Lebanon and Turkey, made it clear that more pressure must be brought to bear on ISIS extremists.

A French security official said anti-terror intelligence officials had identified Abdelhamid Abaaoud, a Belgian of Moroccan descent, as the chief architect of the Paris attacks.

The official cited chatter from ISIS figures that Abaaoud had recommended a concert as an ideal target for inflicting maximum casualties, as well as electronic communications between Abaaoud and one of the Paris attackers who blew himself up. The official spoke on condition of anonymity to discuss the sensitive investigation.

It was not clear where Abaaoud is.

French Interior Minister Bernard Cazeneuve conceded that "the majority of those who were involved in this attack [in Paris]were unknown to our services."

In Paris, the Eiffel Tower was shut down again Tuesdayafter opening for just a day, and heavily armed troops patrolled the courtyard of the Louvre Museum.