They are chilling artifacts of Paris’ night of terror: the smiling faces of the lost.

In the hours after Friday’s carnage, parents, other relatives and friends took to social media to search for loved ones who were feared dead or injured.

Using the hashtag #rechercheParis, they posted photos and details of their missing loved ones.

The images are particularly haunting for New Yorkers, who can still remember the similar, paper flyers that lined the streets of Manhattan in the wake of the terrorist attacks on the World Trade Center in 2001.

“We are looking Marie who was at the bataclan [sic], we have no news,” tweeted Clara Regrigny, a French national who was searching for her friend.

Hours later, an update revealed that her fears had been confirmed.

Marie, and a man named Mathias, were among the 129 who died in the attacks.

“The search is over, I have no words, only tears,” read an update posted Saturday afternoon. “Marie and Mathias have both left us.”

Also Saturday, a Le Monde reporter released his harrowing video showing screaming victims running into the narrow alley behind the Bataclan Theater.

“Everyone was running from all sides,” the reporter, Daniel Psenny, said of the chilling clip he filmed Friday night from outside his apartment window.

“I thought about the images of September 11th,” he said.

“I saw people on the ground, covered in blood,” he told The Sunday Times of London. “People were scrambling to get away from the theater, some dragging bodies with them, leaving bloody streaks on the streets.”

More than 1,500 cheering, drinking, crowd-surfing fans had packed the theater — a full house illuminated only by colored spotlights — all enjoying the California rock band Eagles of Death Metal.

Audience members lunged for the exits or for cover when the shooting started. Then, the shooting paused and the house lights were thrown on — likely by the terrorists.

The musicians — who had been revving up the crowd with English-language cheers of, “Are you ready to rock ’n’ roll?” — put down their guitars and fled.

“Everybody went quiet,” recalled John Leader, 46, who had brought his son, Oscar, 12, to the concert.

Leader pushed his son behind some sound equipment. From their hiding spot, they listened in abject fear.

“It was clinical. All you heard was: Bang! Bang! Bang!” the dad told Britain’s Telegraph newspaper Saturday, describing the terrorist who stood closest to him and his son.

“The shooter was standing at the back of the hall and targeting people at the front. He was taking aim. He was not spraying. It was clinical. He was aiming: aim, fire, aim, fire, aim, fire.”

The shooter reloaded three or four times.

“Everyone was thinking: If I move, I’m dead,” the dad said. Then came a lull in the shooting.

“Ils sont partis!” someone shouted. “They are gone!”

“I grabbed Oscar and said, ‘Let’s go!’ ” Leader recalled.

“Then we saw a lake of blood and bodies lying everywhere.”

Leader and his son looked for an emergency exit.

Psenny, meanwhile, stopped videotaping. He ran to the alley to help the injured. He rushed to the side of a fallen American, who’d taken a bullet to the leg.

But the cries of “Ils sont partis!” had come too soon.

One of the terrorists shot down into the alley, and Psenny caught a bullet.

“I remember feeling as if a firecracker had exploded in my left arm,” he said.

Neither was the danger over for the other survivors.

“We had to hit the deck again because there was more shooting,” Leader said.

Then, “during another lull I pushed Oscar towards the stairs that led to the exit. I ended up being about five seconds behind him getting out, and when I did get outside, he was gone,” Leader said, recalling the panicked moment the boy vanished.

The shooting started up again, but Leader did not resume cowering.

“I screamed, ‘Oscar!’ ”

Leader and his son — along with the wounded Psenny and the injured man whom Psenny was helping — all got away alive.

Psenny and the injured American hid in Psenny’s apartment building. Psenny stanched their bleeding with tourniquets he tore from his shirt. Eventually the men were rescued by French special forces.

And after what seemed an eternity, Leader was able to reach his son on his cellphone.

“I ran to meet him,” the dad recalled. “He’d lost his wallet and his shoes during our escape from the Bataclan.”

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