U2 lead singer Bono required surgery after getting into a cycling accident in New York City earlier this week, and it turns out that his injuries may be more severe than previously indicated. Rolling Stone spoke with the singer’s doctors at New York Presbyterian Hospital, who said that Bono would require “intense and progressive therapy” to recover from his injuries.

According to doctors, Bono’s injuries were caused when he attempted to veer out of the way of another cyclist while riding in Central Park. The resulting injuries required the singer to undergo five hours of surgery. Bono suffered a “facial fracture involving the orbit of his eye,” three shoulder fractures, and a fracture in the humerus bone in his upper left arm.

The latter injury was the most severe; the bone was shattered and required two metal plates and 18 screws to repair. Doctors have given no timetable on his recovery, but they do expect him to recover fully.

The severity of Bono’s injuries does put U2’s upcoming world tour in doubt, though the band have not announced any tour dates as of yet. They were forced to cancel their residency on The Tonight Show Starring Jimmy Fallon, which was supposed to start this week.