At least four people were killed on Friday in a car-bomb attack against a Shiite mosque in the eastern Saudi city of al-Dammam, according to Saudi Interior Ministry spokesman Gen. Mansour al-Turki.
The assailant driving the car bomb detonated the device when Saudi security forces approached the vehicle, which reportedly was heading toward the entrance of the mosque.
Explosions rang out just following the communal Friday prayers at al-Anud Mosque, resulting in the death of at least three civilians and the suicide bomber.
Exactly one week ago in eastern Saudi Arabia, another suicide bomber attacked the Shiite Imam Ali Mosque in al-Qadih city, located in the eastern province of al-Qatif, leaving 21 people dead and dozens wounded, of which Islamic State later calimed responsibility.
Saudi Arabia's Shiite community accounts for about 10 percent of the population, while many of them live in the eastern part of the Sunni kingdom.