"The interior ministry announces that security services have arrested in different regions 12 people sentenced in the so-called Abdali cell", a statement from the ministry said.
Weapons and ammunition seized by Kuwaiti authorities after their discovery of the al-Abdali cell in 2015.
Authorities are still searching for two others convicted in the same case and still on the run, the statement added.
Their disappearance sparked a downturn in diplomatic relations with Iran, with Kuwait asking Tehran to reduce its diplomatic presence in the country.
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The Supreme Court in June overturned an acquittal by an appeals court and convicted 21 of forming a "terrorist cell" with ties to Iran and Hezbollah. Four men remained at large.
The cell had planned to launch attacks across the Gulf state, according to the court verdict.
One Iranian man was tried in absentia and the rest are Kuwaiti nationals. Kuwait, which has close proximity with two regional powers and arch-foes - Saudi Arabia and Iran - is also experiencing turbulence due to the volatile situation in its northern neighbor, Iraq, where the government is battling against the militant "Islamic State" (IS) group.