Ten buses with Croatian pilgrims departed on Thursday from Zagreb to Germany where they will take part in the meeting of young Catholics which will be held under the slogan "We Have Come to Worship Him".
The official programme of the event starts on 16 August.
Petrak said that 6,577 reporters would cover this event which would finish on 21 August.
According to the officials web site of 20th World Youth Day which describes the World Youth Day as the Catholic Church"s mega event, hundreds of thousands of young people from all over the world come together every two or three years on such meetings.