Papua New Guinea is turning away all visitors from Asia...

Detectives and members of the CSI Unit at the scene of the stabbing inside Morningside Park.

A Manhattan grand jury will soon weigh charges against two 14-year-old suspects in the Morningside Park slaying of Barnard College student Tessa Majors, according to law-enforcement sources.

The panel will review the evidence cops have assembled since the Dec. 11 murder of Majors in what sources have called a robbery gone wrong.

Among that evidence is a knife believed to be the murder weapon, according to a high-ranking police source.

Investigators found the blade shortly after the slaying, but didn’t confirm until Wednesday its connection to the case while awaiting the results of forensic testing, according to one NYPD insider.

“You don’t find a knife at a murder scene and say ‘that’s not related,’ ” said the source.

Majors, 18, was fatally stabbed inside the Upper Manhattan park just blocks from her campus last month.

Zyairr Davis, 13, was arrested days after the knifing on charges including felony murder, and is being held in a juvenile detention facility as his case plays out in family court.

He has allegedly admitted to robbing Majors at knifepoint along with two 14-year-old boys, but has denied being the one who plunged the blade into the aspiring journalist with such force that feathers flew from the lining of her jacket, police sources have said.

The grand jury will soon contemplate whether authorities have assembled sufficient evidence to bring charges against the two older teens.

One of the 14-year-old suspects was taken into custody, but ultimately released without charges when he requested a lawyer, sources have said.

The other 14-year-old also eventually met with police after weeks on the lam, and too was cut loose without charges — but not before submitting to DNA testing in an attempt by authorities to tie him to the crime scene.

Sources have said that the teen may have snapped and killed Majors after she bit his finger in a desperate fight for survival.

The names of the 14-year-olds are being withheld because they have yet to be charged with a crime.