Six more people have been found dead in the rubble of the three-story building that collapsed at the edge of a Brooklyn construction site, bringing the death toll to eight, authorities said Thursday.

Scores of firefighters and cops used pickaxes and power saws to search for survivors overnight into Thursday morning as rescue dogs sniffed for signs of life. The two most recently discovered bodies were found about 5:30 a.m. Thursday.

“Rescue workers have spent the night searching the site of yesterday’s building collapse, working under extremely dangerous conditions to find and save anyone who may still be trapped,” Mayor Mamdani said on social media Thursday morning.

“I am heartbroken that eight New Yorkers have now lost their lives and at least 17 have been injured, including three firefighters. There are no words for a loss of this magnitude.”

At least seven children and a pregnant woman were among those pulled from the rubble in the hours after the collapse.

It was not immediately clear how badly the pregnant woman was hurt. An FDNY source confirmed she was hospitalized Wednesday night as firefighters with K-9 dogs continued to search the area looking for voids where people may be trapped.

“We do not know how many people are in the collapse zone,” FDNY Fire Commissioner Lillian Bonsignore admitted at a press conference Wednesday night. “This will be a prolonged operation.”

Rescuers were painstakingly combing through the rubble of 1321 Flatbush Ave. — a three-story mixed-use building in Flatbush — that collapsed and slid into an adjacent construction site shortly after 4 p.m., police said. The building had been perched at the edge of the site at 2625 Bedford Ave., where a construction crew was excavating the property for a proposed three-story building.

When the building collapsed, it took the side wall of 1323 Flatbush Ave. with it, exposing the rooms inside, including a bedroom and closets filled with clothing.

Several of the injured were construction workers working on the Bedford Ave. site, officials said. The seven children injured lived in the two buildings.

The names of the two deceased were not immediately disclosed.

“I want to ask New Yorkers to take a moment to pray for those who passed away today and all those who are mourning their loss, and for a fast and full recovery for those who are injured,” said Mayor Mamdani at a press conference at the scene.

Bonsignore described the rescue operation as “extremely dangerous,” with firefighters facing a high risk of shifting debris and disrupting piles that endangered both those who are trapped and first responders.

The most critical hazard, according to FDNY Chief of Department Joe Esposito, was the risk of a secondary collapse of 1323 Flatbush Ave., most of which was still standing.

“This is an extremely dangerous operation for all of our people,” said Esposito.

An FDNY fire company returning from another emergency arrived about a minute after the collapse, Esposito said. Those firefighters immediately began removing people who were trapped in the partially collapsed building.

The fire department is prepared for an exhaustive search of the debris that will likely last several days, Esposito said. More than 250 FDNY firefighters and EMTs were on scene Wednesday night.

Mamdani advised drivers to avoid the area, as emergency workers shut down Flatbush Ave. between Clarendon Road and Bedford Ave. for the rescue operation.

“As emergency operations continue, please join me in holding our neighbors and the members of this community in our hearts,” the mayor said.

As the search continued, one frantic man told an ABC Eyewitness News reporter that his pregnant wife was inside the building when it collapsed, and he hadn’t been able to get a hold of her.

She was found alive in the rubble at around 6:30 p.m., as firefighters broke through a massive piece of debris to gain access to the woman. Images captured later that evening show Public Advocate Jumaane Williams consoling the pregnant woman’s husband as she was loaded into an ambulance.

“She is alive,” he told reporters through tears.

The extent of her injuries was not immediately disclosed.

Images taken at the scene show a massive pile of wood and debris — which was once 1321 Flatbush Ave. — filling the construction site.

Firefighters were digging by hand, tossing chunks of rubble aside. As darkness fell, firefighters used flashlights to illuminate the area where they worked.

The dead include at least one construction worker, officials said. The injured were taken to local area hospitals, including Kings County Hospital.

The Red Cross set up a reception center for people displaced by the collapse at the Flatbush YMCA at 1401 Flatbush Ave., where one injured individual could be seen entering an ambulance outside the community center Wednesday night.

By 11 p.m., the Red Cross had registered more than four households — 12 adults and three children— for emergency assistance, including temporary lodging, according to Red Cross spokesman Frederic Klein. Besides the building that collapsed, three other buildings have been evacuated.

“I know that there’s a universe of four buildings — one collapsed and three are determined by the city not safe,” he said.

The displaced tenants will be put up in hotels, according to Red Cross volunteer Rosaura Soto as she carried in two large sacks filled with blankets, water and snacks for those inside.

“All things considered, their heads are up,” Klein said. “And they’re family units. A mom with her kid playing on the ground. Three people in their 20s. A group of seven.

“Somebody brought pizzas in from the community. People want to help. It’s just a reminder of how good people can be to each other,” he said.

As the night drew on, a family raced out of the YMCA with a baby in tow and ran to an awaiting Uber. The family was going to a nearby hospital to check on their son, who was caught in the collapse.

“It’s my husband’s son,” one woman said. “He was working in the back of the building. We are going to the hospital. I’m sorry, we have to go.”

It wasn’t immediately clear how many people lived inside the affected buildings, many of which had storefronts on the first floor.

A woman who knows a tenant at the building that suffered a partial collapse said her friend lost everything.

“They don’t have nothing,” said the woman, whose child goes to school with the displaced tenant. “Half the building came down.”

“Her child and her husband, her whole family,” said the stunned woman, who wished not to be named. “I hope she goes somewhere safe.”

Gov. Hochul said her “heart breaks for the family who lost a loved one in today’s building collapse in Brooklyn.”

“I’m keeping them in my thoughts and praying for everyone affected,” the governor said in a statement on X. “My administration has reached out and offered its full support as authorities investigate what happened.”

News helicopter footage showed dozens of firefighters homing in on one area and appearing to use a saw to cut through the wreckage.

A drone flew overhead and firefighters shone flashlights on the debris as night fell over the rescue operation.

Aerial videos showed firefighters digging at least one person out of the rubble and removing them on a stretcher.

The Department of Buildings sent inspectors to the collapsed building, where they assisted with the recovery operation and checked the structural stability of nearby buildings.

City records show that the contractor overseeing the Bedford Ave. construction site was given a violation in April for continuing a demolition operation despite a stop work order. The violation was ultimately resolved, city records show.

Housing, Preservation and Development records show that 1321 Flatbush Ave. was subject to 98 open violations, including defective doors, unsafe electrical wiring, leaking ceilings, defective fire retardant material, and missing or malfunctioning smoke and carbon monoxide detectors.

It was not immediately clear if any of those violations would have affected the building’s stability.

The city approved permits to build a three-story building at 2652 Bedford Ave., but developers are seeking approval for a nine-story structure with a cellar, according to DOB commissioner Ahmed Tigani.

An investigation into what sparked the collapse was ongoing.

Public Advocate Jumaane Williams said there were concerns from the community about the construction site.

If you are unable to reach someone you believe may have been affected by the collapse, please call 311, city officials said. If you are outside NYC, call 212-639-9675.

With Thomas Tracy and News Wire Services

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