BIRMINGHAM, Ala. – Elton John has cancelled a concert set for Friday night in the U.S.

The British singer was supposed to perform in Birmingham, Alabama. Ticketmaster announced the cancellation on its website.

Officials at the arena say medical reasons are being cited for the cancellation, but they don’t have details.

A photo on the arena’s Facebook page shows the singer’s piano already was in place and ready for the show.