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DENVER — Janet Jackson’s concert, scheduled for Sunday at the Pepsi Center, was postponed, according to the singer.

Jackson announced on Facebook and Twitter that because of medical complications, she has been put under doctor’s orders to rest her vocal cords, causing her Salt Lake City and Denver tour dates to be postponed.

All tickets purchased for the Sunday concert will be honored at the rescheduled date that has yet to be announced, according to LiveNation and the Pepsi Center.