ISIS claimed responsibility for the May explosion at a Shiite mosque in al-Qadeeh village east of Saudi Arabia during Friday prayers, which killed 20 people.

Saudi Arabia launched an “anti-terror” sweep last month, during which they captured hundreds of people they claimed were ISIS members.

Officials identified the driver as a 19-year-old Saudi and said he had killed his uncle, a colonel, before blowing himself up on a road near the Al-Hair prison, a high security facility.

ISIS is “bitterly opposed to Gulf Arab rulers” and “is trying to stir sectarian confrontation on the Arabian peninsula to bring about the overthrow of the states’ ruling dynasties”, Reuters noted.

Saudi Arabia – a regional Sunni powerhouse – is part of a U.S.-led anti-ISIS coalition battling the Sunni militant group in Syria and Iraq.