Photo by Matt Cohen.

When news broke about the suspicious events surrounding the alleged suicide of Sandra Bland while she was in police custody, Lois Wilkins said got a call from her daughter. “Mom, I could have been Sandra Bland!” she told her mother. “And I want you to know if I’m ever arrested, I would never commit suicide.”

Soon after that phone call, Wilkins—a mother of four—started a MoveOn.org petition calling for Attorney General Loretta Lynch to investigate Bland’s death. Since Wilkins started the petition—just days after Bland was found dead in her jail cell on July 13—it has garnered nearly 400,000 signatures. Wilkins and dozens of activists delivered those signatures, as well as more than 100,000 others collected by various organizations, to the Department of Justice this morning. They also delivered a clear message: change needs to happen.

“I’m tired of these deaths at the hands of police,” Wilkins said. “I’m tired of being afraid for the lives of my adult children.”

Bland’s death has made national news and attracted the attention of activists due to questions of possible police brutality and the mysterious nature of her alleged suicide. The 28-year-old woman from Illinois was pulled over on her way to a job interview on July 10 in Texas by a state trooper for a minor traffic violation. The interaction between the two escalated after the officer alleged that she assaulted him, and she was arrested and imprisoned. Three days later, she was found dead in her jail cell. Police say she hung herself.

But, as Chicagoist reports, Bland’s suicide raised serious concerns from friends and family.

“The family of Sandra Bland is confident that she was killed and did not commit suicide. The family has retained counsel to investigate Sandy’s death,” a statement from a law firm representing Bland’s family said, according to the Chicago Tribune.

Authorities were slow to release details about her death, but both Texas police and the FBI announced they had begun a joint investigation into her death, investigating it as a possible murder. The 52-minute dashcam video, which was released publicly, appeared to be edited, some viewers noted, but authorities investigated and determined it wasn’t. A voicemail by Bland to her family that was released last week “shows a woman who was angry and baffled by her incarceration, but not suicidal,” her family and friends told authorities.

As many questions remain about the nature of Bland’s death, activists who have rallied in response to similar deaths of black Americans at the hands of police brutality are saying enough is enough.

“What we know is that police can’t police themselves,” said Rashad Robinson, Executive Director at ColorOfChange, an online civil rights organization focusing on criminal justice and police reform. “We should not have to protest every time a black person is harmed by the police.”

Just yesterday, University of Cincinnati police officer Ray Tensing was indicted on a murder charge for the shooting death of Samuel DuBose on July 19., a black man who was pulled over for a traffic stop. “I’ve been doing this for over 30 years. This is the most asinine act I’ve ever seen a police officer make—totally unwarranted,” Hamilton County Prosecutor Joe Deters said at a press conference yesterday. “It’s an absolute tragedy in the year 2015 that anyone would behave in this manner. It was senseless.”

The swift arrest and indictment of Tensing has left activists wondering why Bland’s death hasn’t been similarly addressed.

“It has been 17 days since Sandra died and we still don’t know what happened,” Robinson said. “We are asking the Department of Justice to investigate what happened to Sandra … and hold those accountable [for her death] responsible.”

At the steps of the Department of Justice, with dozens of people—as well as leaders from various local organizations—rallying behind police barricades, several men from Attorney General Lynch’s office came down to collect the signatures and promised Wilkins they would deliver them to Lynch herself. Wilkins thanked them and, in a polite manner, asked them to please open an investigation into Bland’s death.

“If she were still alive, she would expect nothing less,” Wilkins said.