LONG BRANCH, N.J. (CBS) — Police have arrested a 16-year-old boy who they say shot and killed his parents, sister and a family friend inside a home in the New Jersey shore town of Long Branch, Monmouth County.

Police were called to the scene around 11:45 p.m. Sunday in the 600 block of Wall Street, where they discovered the bodies of four people.

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The Monmouth County Prosecutor’s Office identified the victims as the teen’s parents, Steven and Linda Kologi, 44 and 42 respectively, his 18-year-old sister, Brittany, and 70-year-old Mary Schultz, who lived with the family.

Authorities said it appeared the teen used a semi-automatic rifle in what they described as an isolated domestic incident.

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He was taken into custody without incident.

Authorities said the teen’s grandfather and brother were not targeted and left the home unharmed.

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Charges were expected to be filed later Monday.