The Treasury Department is sanctioning three leaders of the Islamic State, including a senior oil official, who are instrumental in the group's finances and recruitment.

Thursday's action is another step in the Treasury's efforts to disrupt the group's ability to profit from illicit oil sales in Iraq and Syria and hamper its access the international financial system.

The sanctions come ahead of a meeting Sunday in Paris of officials from around the world who are working to stem the flow of money to the militant group.

The action freezes any property or interest in property the three have within U.S. jurisdiction and bans Americans from doing transactions with them.

The three individuals targeted are: Faysal Ahmad `Ali al-Zahrani, Husayn Juaythini and Turki Mubarak Abdullah Ahmad al-Binali.