The U.S. government officially designated two officials of rival jihadist groups in Syria as "global terrorists" Wednesday, warning other Syrian rebel groups to stay away from both men.

The U.S. Treasury added Saudi-born Abd Al-Rahman Muhammad Zafir Al-Dubaysi al-Juhni and Iraq native Abd Al-Rahman Mustafa al-Qaduli to its list of Specially Designated Global Terrorists.

The two were cited for their ties to, respectively, al-Qaida operations in Syria, and Qaida breakaway group the Islamic State of Iraq and the Levant (ISIL).

Al-Juhni is part of a group of senior Qaida operatives in Syria formed to attack Western targets outside the country and also to mediate tensions between ISIL and the Al-Nusra Front, the local Qaida affiliate, the Treasury said.

Al-Qaduli is a senior ISIL official who joined Qaeda 10 years ago and previously worked for leader Abu Musab al-Zarqawi, formerly the Qaida commander in Iraq, it said.

The designation aims to limit their access to financial and business networks by banning any American or American business from dealings with them and freezing any U.S. assets.

Treasury Under Secretary for Terrorism and Financial Intelligence David Cohen said the act sends a message to other Syrian rebels to not work with them

"We are very concerned about al-Qaida networks moving money and fighters to extremist groups in Syria," he said in a statement.

The action "sends a strong warning to the legitimate Syrian opposition and those who wish to support it that they must reject the attempts of al-Qaida, ISIL, and Al-Nusra to elicit support for their cause by preying on the sympathies of the international community for the plight of the Syrian people."