BALTIMORE — Prince took the stage in Baltimore before thousands of fans who were dressed in gray in tribute to a man whose death in police custody prompted riots and drew international attention.

The pop star announced Sunday’s “Rally 4 Peace” concert at the Royal Farms Arena Baltimore after weeks of protests over the death of Freddie Gray. During the show, Prince debuted a song he wrote for the city in the wake Gray’s death.

“For those who have lost loved ones, we’re here for you tonight,” Prince told the crowd before launching a set that included his most famous hits.

Prince also called on the city’s youth to fix a “broken system.”

At one point, Prince invited onstage Baltimore State’s Attorney Marilyn Mosby, who has charged six officers in Gray’s death.