Nine Americans have been detained on terrorism charges in Saudi Arabia over the past week, according to the English-language daily Saudi Gazette. The American citizens were arrested along with 24 other suspects, including 14 Saudis, three Yemenis, two Syrians, an Indonesian, a Filipino, a United Arab Emirates citizen, a Palestinian and a citizen of Kazakhstan, the newspaper reported on Sunday citing an unnamed source.

According to the paper, four Americans were detained on Monday and another five were arrested in the following days. The US embassy refused to immediately respond to a request for comment.

The report comes as five people were killed on Friday in a suicide bomb attack and shooting at a mosque in the region of al-Ahsa, in Saudi Arabia’s Eastern Province, which has a Shia-majority population. At least ten people were wounded in the attacks, which targeted the Imam Reza Mosque in the town of Mahasen in al-Ahsa. Also in late October, the Daesh (ISIL) terrorist group claimed responsibility for a suicide bombing at a Shia mosque in Najran city. The attack killed at least one person and injured 16 others.

Some 532 Daesh terrorist suspects, who are charged with planning a series of terrorist attacks in the Kingdom, are currently under investigation prior to their trial at Criminal Court in Riyadh. Most of the arrested terrorist suspects are Saudis, but they also include Egyptians, Yemenis, Jordanians, Algerians, Chadians, Nigerians and others from unidentified nationalities.

ISIL terrorists, who were initially trained by the CIA in Jordan in 2012 to destabilize the Syrian government, now control parts of Syria and Iraq. They have been engaged in crimes against humanity in the areas under their control.

The US and some of its regional allies, including Turkey, Saudi Arabia and Qatar, have lent staunch support to the Takfiri group. According to an influential Iraqi parliamentary leader, the ideology embraced by the Takfiri Daesh terrorist group originates in Saudi Arabia.

Hadi al-Amiri, the head of the Iraqi Badr Organization, told Reuters last week that Wahhabism – the ideology of Daesh and other extremist groups – originates in Saudi Arabia, where officially-sanctioned preachers propagate the ultra-hardline worldview.