Solange Knowles joined protesters marching the streets of Baton Rouge this weekend in the wake of Alton Sterling's death.

Sterling was fatally shot by police early Tuesday in the Louisiana city, the first victim of a brutal week that also saw the killings of Philando Castile in Falcon Heights, Minn., and five police officers during protests in Dallas.

Knowles, who lives in New Orleans, criticized the march's police presence on Twitter, writing that officers threatened peaceful protesters, most of whom were teenagers, with assault weapons.

Protesters/marchers have been nothing but peaceful today in Baton Rouge. Police are here pulling out tear gas while children are around.
— solange knowles (@solangeknowles) July 10, 2016

Most of the march/protest speakers in Baton Rouge were all under 17 years old...
We all left feeling uplifted....
— solange knowles (@solangeknowles) July 10, 2016

Yet as I walked back to my car I personally saw @BRPD pulling huge assault rifles out on peaceful protesters...
— solange knowles (@solangeknowles) July 10, 2016

Photos circulated on social media of Knowles and her husband Alan Ferguson joining the march.

📷 @Poeticvisionary

— ㅤ (@babyheirandafro) July 11,

Over 100 marchers were jailed after the protests Saturday, including prominent civil rights activist DeRay Mckesson, who shared a photo with Knowles and Ferguson thanking them for their presence that weekend.

"The police in Baton Rouge have been truly awful tonight," Mckesson said in a live stream the protest on Periscope. "They have provoked people, they chase people just for kicks. The police have been violent tonight. The protesters have not."

Solange isn't the only Knowles sister speaking out about the recent police shootings. Her older sister Beyonce posted a letter on her personal website last week condemning the killings, and stopped her concert in Glasgow for a moment of silence for victims of police brutality later that week.