Britain closed its embassy in Azerbaijan on Monday because of security concerns and the United States moved its embassy to limited operations, also citing security, officials said. Neither embassy would comment on the nature of the threat.

"The embassy is closed due to some local security concerns. The situation will be kept under review," a spokeswoman for the British embassy said.

A spokesman for the U.S. embassy said, "The embassy has gone to limited operations in connection with a threat against the embassy," Reuters reports.

As reported by Day.az, the office of BP Azerbaijan was also closed today as a preventive measure. Meanwhile the Azeri Ministry of Interior, Ministry of National Security and Ministry of Foreign Affairs said they are not aware of the threat.