Earlier, at least one explosion rocked the eastern city of Qatif, where many minority Shia Muslims live.
A suspected suicide bomber also died after detonating a device near the US consulate in the city of Jeddah.
The Prophet’s Mosque is the burial place of the Prophet Muhammad and Medina the second-holiest city in Islam after Mecca.
A suicide bombing has been reported outside the Prophet’s Mosque – one of Islam’s holiest sites – in Saudi Arabia’s city of Medina.
Social media footage showed a blazing vehicle and billowing smoke.
[youtube url=”https://www.youtube.com/watch?v=2peREduCpk4″ width=”560″ height=”315″]
