The Pope celebrates Palm Sunday Mass at St Peter's Square
Pope Benedict XVI celebrated Palm Sunday Mass today, opening the Catholic
Church's solemn Holy Week with an open-air service in St Peter's Square.
Palm Sunday commemorates Jesus Christ's triumphant entry into Jerusalem.
It is the start of the church's most solemn week, which includes the Good Friday
re-enactment of Christ's crucifixion and death and his resurrection on Easter