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 / Updated  / Source: Associated Press
By The Associated Press

RIYADH, Saudi Arabia — Saudi Arabia announced Saturday it has broken up planned ISIS attacks in the kingdom and arrested more than 400 suspects in an anti-terrorism sweep, a day after a powerful blast in neighboring Iraq killed more than 100 people in one of the country's deadliest single attacks since U.S. troops pulled out in 2011.

Image: Suicide bomber detonates inside Shiite mosque in Saudi's east
People help a man wounded in a suicide attack on the Shiite Imam Ali mosque during Friday prayers in a village in the eastern province of Qatif, Saudi Arabia, on May 22, 2015.STR / EPA

The Saudi crackdown underscores the OPEC powerhouse's growing concern about the threat posed by the terror network, which in addition to its operations in Iraq and Syria has claimed responsibility for recent suicide bombings aimed at Shiites in the kingdom's oil-rich east and in next-door Kuwait.

Related: Kuwait ID's Mosque Bomber as Saudi Named Fahd Suliman Abdul-Muhsen al-Qabaa

The Saudi Interior Ministry accused those arrested over the "past few weeks" of involvement in several attacks, including a suicide bombing in May that killed 22 people in the eastern village of al-Qudeeh. It was the deadliest militant assault in the kingdom in more than a decade.

It also blamed them for the November shooting and killing of eight worshippers in the eastern Saudi village of al-Ahsa, and for behind another attack in late May, when a suicide bomber disguised as a woman blew himself up in the parking lot of a Shiite mosque during Friday prayers, killing four.

The Interior Ministry said that in June they thwarted a suicide bomb attack on a large mosque in eastern Saudi Arabia that can hold 3,000 worshippers, along with multiple planned attacks on other mosques and diplomatic and security bodies.

Those arrested included suspects behind a number of militant websites used in recruiting, the ministry said.