UPDATE AP: Riyadh - State-linked Saudi news websites say an explosion has gone off outside one of Islam's holiest sites in the city of Medina, the same day that two suicide bombers struck different cities in Saudi Arabia.Sabq news site reported that the explosion took place on Monday evening. Other sites showed images of what appeared to be a fire outside one of the buildings overlooking the Prophet's Mosque. It was not immediately clear if anyone was killed or wounded.The sprawling mosque where the Prophet Muhammad is buried, is visited by millions of Muslims from around the world each year during pilgrimages to Mecca. The area would have been teeming with pilgrims for prayer during the final days of the Muslim holy month of Ramadan, which ends this week.The Interior Ministry could not be immediately reached for comment. Riyadh - A blast occurred on Monday in Saudi Arabia outside one of Islam's holiest sites, the Prophet's Mosque in Medina, a Saudi-owned television channel reported.Al-Arabiya news channel showed images of fire raging in a parking lot with at least one body nearby.