Warning: Graphic images below

At least one Syrian refugee who had recently entered Europe was among the seven terrorists who carried out the deadliest attacks in France since World War II, according to authorities.

The strikes across Paris left 129 people dead and 352 injured.

ISIS claimed responsibility for the attacks Saturday in a statement that warned, “Indeed, this is just the beginning.”

“This is what we had feared,” the Wall Street Journal quoted a senior French official saying of the specter of terrorists hiding among the 800,000 Syrian refugees who have flooded into Europe so far this year.

At least one of the terrorists was found with a Syrian passport, presumably having made his way to France via Greece as a refugee last month.

A second attacker also may have presented himself as a refugee on the Greek island of Leros two months earlier, officials said.

Authorities wouldn’t rule out the possibility that other extremists tied to the attack remain on the loose.

The first terrorist name was released late Saturday.

Suicide bomber Ismael Omar Mostefai — a 29-year-old Frenchman who joined the shooting spree at Paris’ Bataclan concert hall — was identified by prints lifted from his severed finger, authorities said.

Mostefai lived in Chartres, a town 60 miles southwest of Paris until at least 2012, according to a French politician.

The mayor of Chartres, Jean-Pierre Gorges, who is also a French member of Parliament, named the gunman in a Facebook post.

Mostefai apparently spent several months in Syria during the 2013-14 winter, according to French newspaper Le Monde.

He’d been on terrorist watch lists for radical Islamization since 2010, the paper reported.

An Egyptian also was among the seven attackers who left Parisians reeling from carnage at the concert hall, restaurants and the national soccer stadium.

At least 129 people were killed in a series of unprecedented terror attacks in Paris on Nov. 13. Getty Images Rescue personnel work near the covered bodies of victims outside the Carillon bar on Nov. 13. Reuters French rescuers help a man who was injured at the Bataclan theater on Nov. 13. Reuters AP Reuters The scene inside the Bataclan concert hall minutes after the Paris terror attacks. Mirrorpix.com The Eagles of Death Metal perform at the Bataclan theater moments before the terror attack began on Nov. 13. Getty Images Two women hang from the outside of the Bataclan as they try to escape the gunmen inside. Getty Images Getty Images People cover a body near the Cafe Bonne Biere. Getty Images Getty Images Getty Images AP AP Reuters Getty Images The scene outside the Stade de France in Paris after a suicide bomber attacked the stadium during a soccer match. Zumapress.com Getty Images Getty Images Getty Images Getty Images EPA Zumapress.com Reuters Rescue personnel help victims of the Paris terror attacks on Nov. 13. Zumapress.com AP Getty Images Reuters EPA Reuters French President Francois Hollande (rear, center), protected by armed bodyguards, arrives to inspect the carnage at the Bataclan theater early on Nov. 14. Getty Images EPA Supporters invade the pitch of the Stade de France stadium during the match between France and Germany on Friday night. AP Getty Images AP Getty Images AP The lights of the Eiffel Tower were turned off on Nov. 14 in honor of the victims of the previous day's terror attacks. Getty Images Bullet holes fill a cafe's window near the Casa Nostra pizzeria in Paris on Nov. 14. Getty Images A note reading "Your wars our deads" lies on the pavement near what appears to be bloodstains near the Bataclan theater on Nov. 14. Getty Images A man holds his head in his hands as he lays flowers in front of the Carillon cafe in Paris on Nov. 14. AP Discarded shoes lie on the sidewalk outside the Bataclan on Nov. 14. Getty Images A forensic scientist inspects the scene outside the Cafe Bonne Biere on Nov. 14. Getty Images Getty Images A woman cries near Le Petit Cambodge restaurant in Paris on Nov. 14. Getty Images A woman cries outside of the Consulate General of France in New York on Nov. 14. Getty Images Parisians light candles and lay tributes on a memorial at the Place de la Republique on Nov. 14. Getty Images Getty Images A flower is placed in a bullet hole in the window of Le Carillon restaurant in Paris on Nov. 15. Getty Images Getty Images Getty Images Reuters Ad Up Next Close Why Lionel Hollins understands Warriors' championship heart OAKLAND, Calif. — Lionel Hollins knows exactly what’s happening with... 52 View Slideshow Back Continue Share this: Facebook

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If the attack did involve militants who traveled to Europe amid hundreds of thousands of refugees from the Middle East, the implications could be profound as the debate over Europe’s immigration policy reaches a fever pitch.

The attack brought an immediate tightening of borders as President François Hollande, calling the attacks “an act of war,” declared a state of emergency and announced renewed border checks.

Germany also stepped up border checks, but Chancellor Angela Merkel seemed to hold onto her stance of placing no limits on the number of people her country was willing to give refuge.

“[ISIS is] now going after Western institutions — people who are living life…”

Poland’s prospective minister for European affairs, Konrad Szymanski, said that in light of the attacks, his country would not comply with an EU plan to accept refugees unless it received “guarantees of security.”

Brian Michael Jenkins, a terrorism expert, made the stakes clear for all of Europe’s leaders: “The big question on everyone’s mind is: Were these attackers — if they turn out to be connected to one of the groups in Syria — were they homegrown terrorists or were they returning fighters?” he asked.

Asylum-seekers fleeing Syria and other war-torn countries condemned the attacks, fearing it would become even more difficult now to start new lives in Western Europe.

Zebar Akram, 29, from Iraq, said, “This is the same act of terrorism like they act in Syria or Iraq.”

Abdul Selam, 31, of Syria, said he feared that refugees now “will be considered as probable attackers.”

French prosecutor François Molins said the three jihadi teams that carried out the coordinated attacks included at least one cell with ties to Belgium, where three people were arrested Saturday — including a Frenchman who had rented a Volkswagen Polo found near the Bataclan, where 89 were slain.

The raids in the Brussels suburb of Molenbeek came after investigators traced two cars, including the Polo, to Belgium. The second car, with Belgian plates, was seen near a cafe that was targeted.

Authorities believe the atrocity was planned by a network stretching from Syria and the Mideast to Germany, France and Belgium, the Sunday Times of London reported.

A US official briefed on the matter said the attack may indicate a shift in ISIS’s strategy and is a “cause for alarm to all Westerners.”

“They are now going after Western institutions — people who are living life, going to concerts, sports events, going to restaurants. This is very symbolic of life in the West and something that ISIS detests and is repulsed by under their own set of values,” the official told The Post.

Prosecutor Molins said 99 of the wounded were in critical condition after the “act of barbarism,” in which the terrorists shouted, “Allahu akbar” (“God is great”) as they fired AK-47s, threw grenades and finally blew themselves up with suicide vests.

The terrorists at the concert hall mentioned Syria and Iraq, Molins said. Investigators have recordings of two of them at the hall as they spoke in French, El Figaro reported.

“They didn’t stop firing,” Pierre Janaszak, a radio presenter who was at the concert, told Agence France-Presse. “There was blood everywhere, corpses everywhere. Everyone was trying to flee.”

The terrorists were heard raging at Hollande and his decision in September to begin airstrikes on ISIS in Syria.

“I clearly heard them say, ‘It’s the fault of Hollande, it’s the fault of your president, he should not have intervened in Syria,’ ” Janaszak added.

ISIS made light of the West in its statement.

“A group of believers from the soldiers of the Caliphate (may Allah strengthen and support it) set out targeting the capital of prostitution and vice . . . Paris,” the group said.

The statement mocked France’s involvement in airstrikes on suspected ISIS bases in Syria and Iraq, noting France’s air power was “of no use to them in the streets and rotten alleys of Paris.”

The attacks were “prepared, organized and planned overseas, with help from inside [France], which the investigation will establish,” according to Hollande.

Eurasia Group, a leading global political-risk research firm, reported that the attacks “confirm a structural shift in the modus operandi of the Islamic State, and represent a prelude to additional attacks in the West.”