A pair of seventh-grade girls in New Jersey have been pulled from school after allegedly posting a video on YouTube in which they threatened to kill several classmates, authorities said.

The girls at PS 27 in Paterson posted the roughly 20-minute video naming 10 to 12 classmates they wanted to kill and stab, school officials said.

In the video, which has since been taken down from YouTube, one of the girls brags about being a good assassin and explains why she wishes harm on her classmates.

"I have special killing thingies for different people," she says.

"I think about killing her," she adds. "I don't know why she's annoying."

The mother of one of the named students said the incident started Tuesday afternoon during a classroom journal writing exercise. One of the girls wrote and read aloud the names of students she wanted to kill, though not within earshot of the teacher.

"My daughter said to her, 'You want to kill me?'" said the mother, who did not want her name used. "She said, 'Yes I want to kill you.'"

The mother said her daughter called her from a school bathroom, terrified and in tears.

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The school's principal told the mother that the girl who made the threats would be pulled from school and not allowed to return until she was evaluated by a doctor. But the girl was back in school the next day, in a different classroom, because she'd gotten medical clearance.

That afternoon, another student in the class found the threatening video on YouTube. Along with the girl who named classmates, another student participated off-camera.

"She got into detail, that she's going to stab, kill, choke," said the mother. "You can't finish the video, you're so shocked this girl's actually talking this way."

A spokesperson for Paterson schools said the two students have been "removed from the school environment," though it wasn't clear whether they were officially suspended.

"We have been communicating with the parents who had children in the same class as these two students," said Terry Corallo. "We have assured these parents that we have taken this issue very seriously and are taking the necessary steps to address this issue.

"Additionally, the video has been pulled from YouTube. This is now a police investigation and they will have our full cooperation."

The mother of the threatened girl, along with other parents, told NBC 4 New York administrators only removed the girls from class after they reached out to police and to the prosecutor's office.

They said they've learned the two girls have been charged and will be in court Monday, though neither school officials nor Paterson Police have confirmed that.

No one answered the door at the homes of the two girls Thursday evening.

A 23-year-old man and his friend have been arrested in connection with the gruesome killing of his mother, whose body was cut up with a power saw and scattered in bags throughout their Bronx neighborhood, law enforcement officials tell NBC 4 New York.

Both men have admitted to chopping up the body and using a shopping cart to dump the parts along the curb in Morrisania, but each is pointing the finger at the other for killing the mother, 45-year-old Tania Byrd, law enforcement officials said Wednesday.

The initial charges do not include murder. Bahsid McLean, 23, and William Harris, 26, are both charged with unlawful dissection of a human body, among other charges. They were in custody and lawyer information was not immediately available.

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Law enforcement officials tell NBC 4 New York that the two men tell different stories. The son says he left the apartment he shared with his mother at about 3 a.m. Monday to go to the ATM. When he returned, he has told investigators, his friend had stabbed Byrd to death and threatened to kill him and his 6-year-old brother if he didn't help get rid of the body.

His friend, meanwhile, has told investigators that the son told him he killed his mother, and showed him a photograph of her, dead, asking for his friend's help in disposing of her corpse.

The two suspects agree that they went to a Bronx hardware store to purchase supplies for the job, including a power saw and gloves. Investigators say there are bloodstains at the apartment, and that it appears someone tried to clean up the mess with bleach.

An empty power saw box was also found there. The saw was found at the apartment of the friend's girlfriend, officials said.

Law enforcement officials say the pair cut up the body on Monday night and dumped it around 9:30 p.m. Surveillance camera video shows the son in the apartment building lobby, leaving the elevator with numerous bags, and then video outside the building shows two men wheeling away a shopping cart.

Officials say a man walking his dog along 158th Street in Morrisania early Tuesday morning came upon a plastic bag of what he thought were books. As he moved to open the bag, he noticed a vehicle circling the block and became nervous, so he took the bag around the corner and looked inside, finding two hands and a shoulder.

He sent his son to call police and continued walking the dog. About two blocks away on Eagle Avenue he and the dog came upon a suitcase, and the dog sat down next to it. The man opened the suitcase and found a woman's torso, wearing a bra, according to law enforcement officials.

Responding police found a plastic bag further down Eagle Avenue that contained a leg and a foot, and then nearby on Cauldwell Avenue, they found a black suitcase with a leg and the woman's head.

People who knew Byrd were stunned about the grisly killing.

"Every time you see her, she would have a smile on her face," said neighbor Chastity Agosto. "How could a son do that to his mother?