“The U.S. State Department is warning Americans of a terrorist threat to Western targets in Azerbaijan and urging U.S. citizens to be vigilant in the oil-rich former Soviet republic on the Caspian Sea,” The Washington Post reports.

According to a security alert by the U.S. Embassy in Baku, there was a “potential for attacks for U.S. citizens in Azerbaijan”.

“The U.S. citizens in Azerbaijan “should remain vigilant, particularly in public places associated with the Western community,” the statement said.

“The alert did not elaborate on the nature of the threat or who might be behind it,” the source says.