A suicide bomb killed at least four people outside a Shiite mosque in eastern Saudi Arabia on Friday, Reuters reported.
A car exploded outside the al-Anoud mosque in Dammam during Friday's noon prayers, according to Saudi Arabia's Interior Ministry.
Witnesses reported that a suicide bomber dressed as a woman blew himself up in the mosque's parking lot after guards stopped him from entering the mosque.
ISIS claimed responsibility for the attack, in a statement posted on Twitter and Facebook.
#ISIS takes responsibility for the bombing in #Dammam, #Saud carried out by Abu Jandal Al Jazrawi -Statement
The statement identified the suicide bomber as Abu Jandal al-Jarawi described as a "soldier of the caliphate," the Associated Press reported.
It said that al-Jarawi blew himself up among "an evil gathering of those filth in front of one of their shrines in Dammam."
The statement called on Sunni Muslims to "purify the land of the two shrines from the atheist rafida." "Rafida" is a term extremists use to describe the Shia sect as "dissenters" from Islam.
This is the second attack the extremist group has carried out on a Shiite mosque in Saudi Arabia in a month.