(Reuters) - The United States worked together to impose terrorism-related sanctions on two individuals linked to funding two Syria-based groups already sanctioned by the United States and United Nations, the Treasury Department said on Tuesday.

The actions target Omar Alsheak, a leader of Hay’at Tahrir al-Sham group, and Kubilay Sari, who has received funds in Turkey from donors for Katibat al-Tawhid wal-Jihad, the department said in a statement.

"As terrorist groups continue to seek access to the international financial system, collaboration with our partners increases our ability to more effectively disrupt these facilitation networks," said Under Secretary of the Treasury for Terrorism and Financial Intelligence Brian E. Nelson.

The new designations follow joint U.S.-Turkish actions on Jan. 5 that target a key financial network of Islamic State, Treasury said.

(Reporting by Ismail Shakil and Doina Chiacu; Editing by Caitlin Webber)