Billy Porter has joined a chorus of celebrities and advocacy groups in speaking up for the Black LGBTQ community this week after troubling footage showing an alleged attack on a transgender woman went viral.

The incident took place following an otherwise peaceful protest against racial inequality and police brutality, he said, before noting that Dior’s attackers appeared to be Black men.

The National Center for Transgender Equality has condemned the attack, calling Dior an example of the violence facing trans people of color, as well as the unequal treatment and protection they receive from the criminal justice system.

“The world needs to know Iyanna’s name and understand the violence that transgender people – and particularly Black transgender people – face every day,” Mara Keisling, the group’s executive director, told HuffPost in an email statement.

“Black trans people are targeted for violence as they simply try to live their lives.