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Police in New York have arrested a teen suspect in the schoolyard shooting that killed a mother of 12 and injured a fifth grader last week.

According to NBCNY, Andrew Lopez, 18, has been arrested. Sources said detectives tracked him based on a tip

Zurana Horton, 34, died of a gunshot wound to the chest on Friday just after school had let out for the day. A gunman standing on a rooftop across from P.S. 298 opened fire on a crowd of children and mothers standing outside.

Police said Horton tried to shield the schoolchildren from the gunfire when she was shot and killed. “This is the third child I’ve lost from gunshots. I’m really going to miss my daughter,” said Horton’s mother.

11-year-old Cheanne McKnight was shot in the face. She survived her injury and was back at school yesterday. Cheanne’s mother plans to transfer her to another school.

“It ain’t fair a woman had to die to save my child because that woman tried to save my child,” said Cheanne’s mother. “I think something should have been done about this because the day before they was shooting, so these corners should have been covered with police.”

A $15,000 reward had been offered for information leading to the capture of the gunman.

Update: police in New York now have three men in custody for the shooting that killed a 34-year-old Brooklyn mother and injured an 11-year-old girl.

According to NBCNewYork, police said Tuesday that Andrew Lopez, 18, has been arrested on murder and assault charges.

Police later announced another arrest for the same charges: Jonathan Carrasquillo, 22, and a 17-year-old suspect was also arrested for criminal possession of a weapon; in this case, a baseball bat.

Images: Gothamist