Sheikh Hamad bin Khalifa Al Thani, Emir of Qatar, will open tomorrow the 12th Arab Athletics tournament, organized by the Arab National Olympic Committees. Sheikh Tamim bin Hamad Al Thani, Chairman of the Qatari Olympic Committee and Prince Nawaf bin Faisal bin Fahd bin Abdulaziz, President of Youth Welfare Authority of the Kingdom of Saudi Arabia and Chairman of the Arab National Olympic Committees Federation, will be present at the opening ceremony. More than 4500 female and male athletes from 21 Arab member countries in the Arab National Olympic Committees Federation will take part in the 13-day event.