July 16, 2015 9:56 AM EDT

Family and friends of a civil rights activist found dead in a Texas jail have launched a campaign questioning the authorities’ ruling of a suicide.

Sandra Bland was arrested after allegedly becoming combative during a routine traffic stop on Friday. She was found dead in her cell on Monday morning.

The Waller County Sheriff’s Office said the 28-year-old died “from what appears to be self-inflicted asphyxiation,” calling it a “tragic incident.”

However, those who knew Bland don’t believe she would have taken her own life. She had recently moved to the area, about 50 miles west of Houston, and was due to…

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