Sandra Bland’s family filed a federal lawsuit against the sheriff’s office, jail officials and the state Department of Public Safety on Tuesday to seek answers and accountability for her death in a Waller County, Texas, jail cell last month.

“Candidly, we were unable to get many of the answers we have been asking for for weeks,” the family’s attorney, Cannon Lambert, told reporters in Houston as he was flanked by Bland’s mother and three of Bland’s four sisters, who had traveled from Illinois to be at the news conference. All family members wore buttons showing Bland’s face.

“We are looking for Waller County and the individuals involved in this situation to take accountability.”

The family’s motivation, Lambert added, “is that they don’t want to see this sort of thing happen again to another family. … It’s got to stop.”

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