A "major gang war" between ruthless Bronx crews that are fearless of cops has left a 13-year-old boy and two other teens dead in just the past five days, law-enforcement sources told The Post on Monday.

"We can’t keep them in [jail], and they’re going after each other,’’ a high-ranking police source said, referring to juvenile suspects who end up back on the streets after being sent to family court instead of being prosecuted as adults.

A city prosecutor added, "They don’t go to jail, so they do robberies, get in fights and carry guns.

"Life on the streets in 2021."

The first teen to die in the bloody gang-fueled stretch of borough violence was 19-year-old Tyquill Daugherty, who was shot in the head in front of his home in Crotona just before midnight Wednesday, sources and cops said.

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Daugherty’s gang-related death was followed by Sunday’s fatal retaliatory drive-by shooting of Jaryan "Jay Ripp’’ Elliot, a 13-year-old suspected member of the Crips, about five blocks away in Belmont, sources said.

Elliot — who just graduated from middle school  — was at the scene when Daugherty was shot, although he is not believed to have pulled the trigger, sources said.  

The 13-year-old kid already had eight busts under his belt, including for robbery and assault — and had been locked up two times this year before being dumped back on the street, the high-ranking cop source said.

About eight and a half hours after Elliot’s slaying, revenge for his murder was taken on 16-year-old Ramon Gil-Medrano, who was fatally shot by two males on scooters a little over a mile away in Mount Hope, sources said.

Gil-Medrano, who was affiliated with the 800 YGz, or "Young Gunnaz,’’ gang, had been at the scene of the 13-year-old’s slaying, although it is not clear if he is the one who did the killing, sources said.

It’s no surprise there was retaliation for Elliot’s death because "he was crazy and admired by all the gang members, a modern-day Baby Face" a source said, referring to the 13-year-old Bronx boy and the notorious 1930s gangster Lester Gillis Nelson, who was nicknamed "Baby Face" because he looked so young.

"People on social media [were] vowing revenge for his murder," the source said of Elliot.

A borough cop said, "There is a major gang war going on in The Bronx with three teenagers killed in less than a week.

"Everybody is walking around with a gun because they are more afraid of getting shot than getting arrested."

Two more people were then wounded in a double shooting around 4:20 p.m. Monday a little over a mile from where Elliot was killed — a revenge crime for one of the earlier three incidents of gunplay, sources said.

Gil-Medrano had previously been wounded in another shooting July 7, 2020 — a year to the date of Daugherty’s death last week, sources noted.

The 16-year-old was shot at the time by two guys on a scooter on Prospect Avenue, about two blocks from Daugherty’s murder.

The 16-year-old was shot at the time by two guys on a scooter on Prospect Avenue, about two blocks from Daugherty’s murder.

The candles spelled out "JR,’’ for his Jay Ripp street nickname, a 13-year-old pal said.

Two young males dressed in nearly all black with some blue — Crips colors — nodded at the scene when asked by The Post if they were part of his "crew.’’

They posted a fresh $100 bill on one of the candles, and when asked if they were worried someone might take it, one of them smirked and replied, "Nobody.’’

Two young females poured wax from some of the candles to spell  "EOS,’’ which one of them said stood for "Exterminate On Sight.’’

Several people tied blue bandanas to the wrought-iron fence next to the candles.

Elliot’s 13-year-old friend said his dead pal was the middle of three brothers.

"He was going to high school!’’ the friend said. "No more.

"His mom is not doing good right now. It’s sad."

A neighbor added of local young toughs, "They know nothing happen if the cops get ’em!

"It’s catch and release. Why you think they at it so young?’’

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A mother of nine children, including seven boys, said she knew Elliot through her kids and urged parents in the area to stand up and take charge.

"They need to be more aware of what their children is doing,’’ said the woman. "These kids is out here 2, 3 o’clock in the morning. No mothers is looking for them. No mothers is coming to check for them.

"At the end of the day, we, all the mothers, need to come out here and stand up with each other together, you understand, so our children can stop getting involved in all this negativity.

"That’s why I’m out here," she said. "I don’t want my children to die.’’

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