State-linked Saudi news websites reported an explosion Monday near one of Islam's holiest sites in the city of Medina, as two suicide bombers struck in different cities without killing anyone.

Sabq news site and other local media, quoting unnamed sources, said the explosion was caused by a suicide bomber near a security building outside the Prophet Muhammad's mosque. Several cars caught fire. Local media 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 in the blast.

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 packed with pilgrims for prayer during the final days of the Muslim holy month of Ramadan, which ends in the kingdom on Tuesday.