DUBAI - Up to three Muslims thronged the holy city of Mecca in Saudi Arabia on Tuesday night marking Laylat al-Qadr, the night when Islam's, holy book, the Qur'an, was revealed to the Prohpet Mohammad in the year 610. Saudi newspapers said the region's traffic department estimated that up to three million worshippers offered prayers at the Grand Mosque in Mecca, one of Islam's holiest sites.