It is believed that a number of terrorist plots were thwarted. These included possible attacks to Muslim mosques involving suicide bombers, a diplomatic mission, government facilities, and more.
Suspects had committed offenses against the country by providing aid to bombers, smuggling explosives, conducting surveys of possible targets, making vests for suicide bombers, and more. It is known that ISIS has determined to target some of Saudi Arabia's holy places and to remove Shi'ite Muslims from the area.
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Source: http://news.yahoo.com/saudi-arabia-says-arrested-431-islamic-state-suspects-125728266.html
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Graphics: Mine
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Keywords: ISIS, Saudi Arabia, arrested, suspects, offenses