DORCHESTER, MA (WHDH) — Boston Police Commissioner William Evans and Boston Mayor Marty Walsh greeted students at a Dorchester high school Thursday after a 17-year-old student was shot and killed Wednesday.

Police are still searching for suspects.

Patrice Volel said it still has not sunk in that her little brother, Raekwon Brown, was murdered in broad daylight Wednesday afternoon on the sidewalk next to Burke High School on Washington Street.

The high school junior was shot, along with two other teens and a 67-year-old woman who was walking on a sidewalk at the time.

With extra police in place around the school on Thursday and grief counselors inside the school, detectives have been working around the clock to locate the gunman.

Evans said they need help and they are getting it.

“Enough with the stop snitching stuff, we got a mother who lost her 17-year-old child,” he said.  “Step foward, have some courage and help solve this one.”

A memorial grows for Brown in the spot where he was shot, as grieving family members are anxious for an arrest.

“If you can’t do it for us, do it for yourself, turn yourself in,” Volel said.

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