The Allen Police Department said two brothers killed four family members before killing themselves.
Officers discovered the six family members at a home in the Dallas suburb at approximately 1 a.m. on Monday after a friend of the family called to report a social media post from one of the brothers, the Allen Police Department confirmed to The Hill.
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The brother posted a suicide letter on social media describing the graphic incident.
The six deceased are the brothers, Farhan Towhid and Tanvir Towhid; their father, Towhidul Islam; their mother, Iren Islam; their grandmother, Altafun Nessa; and their 19-year-old sister, Farbin Towhid.