Prince has announced plans to perform at a concert in Baltimore following recent unrest in the city over the death of a man who was fatally injured in police custody.

Concert promoter Live Nation apologized Tuesday after fans stood in line for hours as rumours swirled about a surprise Prince concert at Toronto's Massey Hall.

The pop icon announced Monday he would release two albums on Warner Bros. Records, the label Prince was signed to from 1978 to the mid-1990s, but later battled for the rights to his music.