Kuwait also ordered the closure of the Iranian "military, cultural and trade" missions, said the government official, who asked not to be named.
The Gulf state's supreme court last month sentenced the mastermind of the cell to life in jail and condemned 20 others to various prison terms for alleged links with Iran and Lebanese Hezbollah and plotting attacks in Kuwait.
Saudi ally Bahrain demands Qatar distance itself from Iran
According to Reuters, "The government of the state of Kuwait decided to take actions in accordance with diplomatic norms and in abidance with the Vienna conventions with regards to its relationship with the Islamic Republic of Iran," following the court ruling, acting Information Minister Sheikh Mohammad al-Mubarak al-Sabah said.
He gave no further details.
Last year Kuwait convicted a group of men - one Iranian and the rest Kuwaiti - of spying for Iran and Lebanese Shia Muslim group Hezbollah.
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