The video shows the gunmen making their getaway, police said.
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Investigators said the victims had gathered in "shoelace park" for a graduation party.
They believe the 19-year-old woman was an unintended victim. She was shot five times.
Police have identified her as Tyanna Johnson of Seymour, Connecticut.
In addition to the 15-year old, a 16-year old and 24-year old were shot once.
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The victims are listed in stable condition.
The getaway vehicle was a silver BMW.
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