Bomber in Saudi Shiite mosque attack identified as Saudi national

In this still image taken from video provided by Saudi TV, burnt out cars are seen as investigators collect evidence, in the aftermath of a suicide bomb outside the the Imam Hussein mosque in the port city of Dammam, Saudi Arabia, Friday, May 29, 2015. A suicide bomber blew himself up in the parking lot of a Shiite mosque in eastern Saudi Arabia during Friday prayers, killing four people in the second such attack in as many weeks claimed by the Islamic State group. (Saudi Television via AP)

Saudi Arabia says the suicide bomber behind Friday’s attack on a Shiite mosque in the port city of Dammam that killed four people was a Saudi national.

The Interior Ministry on Wednesday identified the bomber as 19-year-old Khalid Ayed Mohammed Wahabi Shammari. He disguised himself as a woman and blew himself up in the mosque parking lot after being prevented from getting inside.

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The ministry says the explosive used was RDX, a military-grade compound that was also deployed in a suicide bombing at another Shiite mosque a week earlier that left 22 people dead.

The Islamic State group has claimed responsibility for both attacks. It sees Shiites as heretics and seeks the overthrow of the Saudi monarchy.