A 14-year-old boy has been arrested in connection with a shooting on Friday night that killed one Newark police officer and injured another, Essex County officials said on Saturday.

The boy, who was also injured, was charged with murder, attempted murder and possessing illegal weapons following the shooting, Theodore N. Stephens II, the Essex County prosecutor, said during a news conference on Saturday. The boy’s name has not been released by the authorities.

The officer who was killed was identified on Saturday as Joseph Azcona, 26, a detective who had served with the Newark Police Department for five years. Detective Azcona died just after 2:30 a.m. on Saturday at University Hospital, officials said.

“These are officers who got up yesterday morning to do their job, to go outside and make sure our streets were safe,” Mayor Ras J. Baraka of Newark said at the news conference. He added that gun violence, especially among teenagers, was an urgent issue in the New Jersey city. “We just have to do a better job. I have to do a better job,” he said. “This is not a police problem. This is our collective problem.”

The shooting that killed Detective Azcona broke out at 6:30 p.m. on Friday near the corner of Broadway and Carteret Street, a busy intersection in the North Ward of Newark.