Taina Darby is outraged the NYPD is being stonewalled in its effort to quiz an alleged jihadist in the brutal stabbing of her 9-year-old son in what might have been a botched ISIS audition.

“I don’t get it,” Darby said after reading The Post’s exclusive report last week on how the NYPD seeks to question “person of interest” Fareed Mumuni.

Mumuni was arrested by the feds in connection with a Times Square pressure-cooker bomb plot five months after Darby’s son, Jermaine Culver, was repeatedly stabbed while walking to his Staten Island school.

The mom said she has “heard nothing” about the case.

“We still don’t know,” said Jermaine’s 21-year-old brother, Shawn Williams. “It seems like the cops gave up on it.”

NYPD detectives investigating the Jan. 9 knife attack have been frustrated by the feds, according to a source familiar with the probe.

Mumuni, 21, lived only 600 yards from Jermaine. A home surveillance camera across the street captured a stocky attacker as he stalked the boy from behind on Union Avenue before grabbing him around the neck and stabbing him in his back, head, neck and arm.

On June 17, Mumuni was arrested by the Joint Terrorism Task Force, who descended on his Mersereau Avenue home in Mariners Harbor to execute a search warrant. Mumuni lunged at an agent with a kitchen knife, authorities said, but the officer’s body armor stopped the blade.

Mumuni, according to court papers, was part of an alleged four-man New York-New Jersey terror operation smashed by the feds.