RIYADH: A suicide blast struck 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.
The explosion occurred in a security forces parking area, Al-Arabiya reported.
Two other bombers blew themselves up earlier Monday on opposite sides of the kingdom.
In Qatif, on the Gulf coast, residents said a suicide bomber blew himself up outside a mosque frequented by the minority community.
Another suicide bomber detonated his explosives earlier near the US consulate in the Red Sea city of Jeddah, injuring two security officers.
Although till now no terrorist organisation has claimed the responsibility for the deadly suicide blast in the holiest place of Muslims however Saudi intelligence officials are suspecting ISIS to be behind these attacks.
ISIS has earlier struck Saudi Arabia with the deadly suicide blasts and these suicide blasts are also being blamed upon the terrorist organisation ISIS.