Essex County's major crimes task force and city police are investigating the attack. He was already wanted on charges of sexual assault and aggravated assault in an unrelated October 9 incident.
The deceased were identified as an 8-year-old girl; an 11-year-old boy and a 23-year-old woman.
Police were searching for 26-year-old Jeremy Arrington in their investigation of the Saturday afternoon attack that also left three people injured, Acting Essex County Prosecutor Carolyn A. Murray said at a news conference after the stabbings. The stabbings occurred around 4 p.m. Saturday at a Hedden Terrace residence.
No arrests have been made in the stabbing, the Newark Star-Ledger newspaper reported in a story on its website, which described a large police presence at the scene.
On Friday, three people were killed and another three hospitalized after a mass stabbing at a Newark home, according to an Essex County prosecutor.
"It is hard for me to even speak about this, having young children of my own", Newark Mayor Ras Baraka told the news conference. He has not been charged in Saturday's stabbings.
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Mr Baraka added: "We can not hide this individual, we have to get him immediately before he hurts someone else".
Though the relationship between the victims was not clear, many are believed to be family members.
"As long as he is on the street none of us are safe".
Mayor of Newark Mayor Ras Baraka has described the scene "horrific and disgusting", telling local media it was "one of the most tragic and savage situations" he has seen in 20 years.
Police have launched an investigaton following the knifing spree at the home in Newark, New Jersey.
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