The human remains in an ancient Roman tomb may belong to Saint Paul, Pope Benedict XVI revealed in a surprise announcement. Now the Vatican wants to open the sarcophagus and conduct further tests.

The marble coffin in Rome's St. Paul's Basilica has never been opened, but, according to tests conducted thus far, the tomb contains pieces of human bone that have been dated to the time of Saint Paul.

Pope Benedict shared the findings Sunday at a service outside the church marking the end of the Vatican's Pauline year in honor of the apostle.