U.S. embassies that would normally be open this Sunday – including those in Abu Dhabi, Baghdad, Cairo – will be closed that day because of unspecified security concerns, the U.S. State Department said on Thursday.

“The Department of State has instructed certain U.S. embassies and consulates to remain closed or to suspend operations on Sunday, August 4th,” State Department spokeswoman Marie Harf told reporters at her daily briefing. “Security considerations have led us to take this precautionary step.”