Update from Associated Press

12:30 p.m.

Boston Police Commissioner William Evans is asking students at a city high school to drop the "no snitching" attitude and tell authorities what they know about the fatal shooting of a 17-year-old classmate.

In a Thursday appearance with Mayor Marty Walsh and school Superintendent Tommy Chang at Jeremiah Burke High School in the city's Dorchester neighborhood, Evans said some students know "exactly what happened" and should show some courage to help the victim's mother get justice.

Evans said the shooting is still under investigation but may have been the result of a prior feud.

Three others were hurt in the shooting outside a pizza shop down the street from the school Wednesday afternoon.

Chang says grief counselors have been brought in and his goal is to return to normalcy.

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The Boston Police Department is asking the public for information after a midday shooting on Wednesday near Dorchester's Jeremiah Burke High School killed a 17-year-old student and injured three others.

Boston Police identified the surviving victims of the shooting as two teenagers and a woman in her 60s, who were all treated for non-life-threatening injuries. The shooting occurred in the area of 46 Washington St. around 1:16 p.m., according to police.

Death Investigation in area of 46 Washington Street in Dorchester. To help solve - please call 1-800-494-TIPS. https://t.co/UyG2W3E610— Boston Police Dept. (@bostonpolice) June 9, 2016

The Boston Globe identified the deceased as Raekwon Brown, a junior at the school. Police Commissioner Williams Evans said students know what happened, but aren't cooperating with police, according to the Globe.

The Dorchester Reporter interviewed people near the scene of the shooting, including a student who said she heard shots while students were outside the school because of a fire alarm.

The Boston Herald talked to a woman who had nearly walked into the crossfire, and a frantic mother of another student, waiting to make sure her son was OK following the shooting.

Thirteen people have been murdered in Boston in 2016, according to Universal Hub.

"When a young man gets shot and killed in broad daylight, we all should be outraged," Evans said in a statement. "I’m calling on the community to step up and help us identify the individual who did this. There were a lot of people out who may have seen something and we need their help. Every bit of information counts. But, if we can’t step up now and work together to solve this crime then something’s wrong."