NEWARK, N.J. - A teenager boy and a man faced murder charges Thursday in the killings of three college students and wounding of another in a schoolyard, a crime considered jarring even in a city used to violence.

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The 15-year-old was arrested Wednesday night, and the 31-year-old surrendered Thursday, authorities said.

"We believe that others were involved in this heinous crime," prosecutor Paula Dow said. "We're looking for them."

Mayor Cory A. Booker said fingerprint and ballistics evidence tied the man, Jose Carranza, to the crime. Carranza turned himself in on three counts of first degree murder, one count of attempted murder and other charges.

The teen, whose name was not released because of his age, was arrested on the same charges, authorities said.

Four friends, ages 18 to 20, were shot while hanging out in a school yard Saturday night. Authorities have said robbery appeared to be the motive.

Three of the victims — Terrance Aeriel, 18, Dashon Harvey, 20; and Iofemi Hightower, 20 — were forced to kneel against a wall and were shot at close range. The fourth, 19-year-old Natasha Aeriel, Terrance Aeriel's sister, survived a wound to her head and is hospitalized.

Despite being under sedation for periods of time, Natasha Aeriel has been providing authorities with information about the shootings, the mayor said.

The killings brought unwanted publicity to the city, which has struggled for years with violent crime. Residents and law enforcement organizations have donated $150,000 to aid the victims' families and to a reward fund.

"This is a defining moment for our city. The crime is not going to define Newark but our response to it," Booker said Thursday on ABC's "Good Morning America."

All four victims were planning to attend Delaware State University this fall. Instead, three were to be buried Saturday in separate services.

A friend of the victims, Samantha Williams, said she was overwhelmed by news of an arrest.

"I can actually stop crying, I can sleep peacefully," said Williams, 18, of Orange.

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All four victims were planning to attend Delaware State University this fall. Instead, three were to be buried Saturday in separate services.

Very sad