The incident happened along Titus Lane in Plainsboro Township, Middlesex County on Wednesday.
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Officials say authorities received a 911 call around 4:40 p.m. requesting a welfare check at a home on Titus Lane.
Plainsboro police officers found the bodies of four victims inside the house.
Law enforcement sources told our sister station WABC-TV that an adult man is accused of killing his wife and two children before killing himself.
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The investigation is ongoing.
Anyone with information or surveillance footage of the area is asked to call Detective Will Atkinson of the Plainsboro Police Department at 609-799-2333 or Detective Javier Morillo the Middlesex County Prosecutor's Office at 732-745-8843.
If you or someone you know is struggling with thoughts of suicide - free, confidential help is available 24 hours a day, 7 days a week. Call or text the national lifeline at 988.
Find support for issues with mental health, drugs, or alcohol through the Substance Abuse and Mental Services Administration, a part of the U.S. Department of Health & Human Services.