The incident was reported around 11 a.m. Tuesday morning at an apartment building near Highland and Park avenues.
The 15-year-old was pronounced dead at the scene and the 11-year-old suffered non-life-threatening injuries and was taken to the hospital.
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Officials initially said five people were taken into custody and questioned in connection to the stabbings.
On Wednesday, officials announced the 16-year-old was arrested and charged in the murder of 15-year-old Elijah Alvarez.
Newark Mayor Ras Barak released the following statement:
"As a city, we mourn the loss of Elijah Alvarez, and we pray for the physical and emotional recovery of his 11-year-old brother injured in the attack on Tuesday morning. Our hearts and prayers go out to the victims' family and the community, and for a speedy recovery of the younger brother."
The 16-year-old, who was not identified because of his age, is also facing charges of attempted murder, burglary, unlawful possession of a weapon and possession of a weapon for an unlawful purpose.
Newark Public Safety Director Anthony Ambrose said the preliminary investigation reveals there is no threat to the public.
The motive in the stabbing remains unknown and authorities are still searching for the weapon used in the incident.
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