Wearing a black hoodie with the movement’s name on the front, the WBA, WBO and IBF world champion joined hundreds of others on the peaceful protest on Saturday afternoon.
At one stage, Joshua, who walked with crutches and wore a leg brace as he recovers from a training injury, addressed those gathered over a microphone.
Joshua’s spokeperson confirmed to Sportsmail that his injury is not serious, saying: ‘Anthony felt a slight twinge in his knee whilst training. The brace Is a precautionary measure on the advise of physios. It will be further checked by his doctors but there is no immediate concern.’
Joshua is the latest high profile sports star to back the BLM movement following the death of African American George Floyd, who was killed by a white police officer in Minneapolis, United States.
Police officer Derek Chauvin has since been charged with second degree murder after a video emerged showing him kneeling on Floyd’s neck for almost nine minutes while he laid on the floor in handcuffs.
His death has sparked a series of sometimes violent protests across the United States and demonstrations around the world.