Kuwaiti security authorities have broken up three ISIL cells plotting terror attacks in the oil-rich Gulf state, the interior ministry said Monday.

Kuwaiti security authorities have broken up three ISIL cells plotting terror attacks in the oil-rich Gulf state, the interior ministry said Monday.

Five Kuwaiti nationals were arrested, including a policeman and a woman, who all confessed to plotting attacks against a Shiite mosque and an interior ministry target, the ministry said in a statement.

All members of the three cells also confessed to being members of the ISIL terrorist group.

Kuwaiti police are still looking for a Gulf man and an Asian who assisted one of the cells, the ministry said.

Among those arrested in the latest police action was 18-year old Talal Raja who confessed to have been plotting a suicide attack against a Shiite mosque and an interior ministry installation on Tuesday, the ministry said.

The second cell consisted of a mother and son who were arrested in Syria in the ISIL-controlled Riga and brought back to Kuwait, the ministry said. It provided no details of how they were arrested.

The 28-year old son had cut short his petroleum engineering study in Britain to join the ISIL after his younger brother was killed while fighting for the group in Iraq, the ministry said.

The third cell comprised of two Kuwaitis, one of them a policeman, who were seized along with two Klashnikov rifles and ammunition. The pair confessed to plotting attacks in the country, the ministry said.

In November last year, Kuwaiti police busted an international cell led by a Lebanese man that was sending air defense systems and funds to the ISIL group.

Several suspected ISIL members and sympathizers were tried in the Gulf emirate for a suicide bombing last month claimed by the group.