In the post, Greta Thunberg comments that "every artist who drops out of the tour and every fan who cancels their ticket is choosing their conscience not to participate in apartheid and genocide."
After Macklemore was dropped from the tour for his support for Palestine, more artists pulled out, including Finneas and the Irish band Beoga, which served as Sheeran's touring band.
It was after a concert in New Jersey, where Macklemore shouted "liberate Palestine" that the organiser stopped him from taking part in the remaining US shows.
Sheeran says he refuses to be drawn into a public debate about the war in Gaza.
