Police say a 17-year-old boy stabbed near a busy MBTA station in Boston has died, and a 16-year-old boy is under arrest.

The victim was stabbed at 3:20 p.m. on Thursday near the Jackson Square station in Jamaica Plain.

Police say the victim was taken to an area hospital and was pronounced dead of his injuries at about 4:30 a.m. Friday.

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The suspect, a Dorchester resident, had already been arrested at 2 a.m. Friday. He is scheduled to be arraigned in Roxbury District Court.

No names were immediately released. The investigation is ongoing.

In an unrelated event, police also are investigating a late night shooting in Boston that left one man dead.

The victim was found outside an apartment complex in the city’s Brighton neighborhood shortly before midnight Thursday.

He had been shot in the chest and torso and was pronounced dead at the scene.

Police have not released his name but say he was 30 years old.

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Witnesses say the shooter fled from the scene on foot.

Investigators are looking at surveillance cameras and canvassing the area.

There was no immediate word on arrests.