Azerbaijan’s Ministry of National Security said it prevented a “large-scale horrifying attack against government structures and diplomatic missions,” including the U.S. Embassy in the capital city, Baku, The Financial times reported.

The ministry said it conducted a raid and made arrests near the village of Mashtagi about 20 miles from Baku early Saturday.

An embassy spokesman said the mission was on limited operations Monday and ceased consular services.

“We are under constant threat everywhere and we are very aware of it,” the spokesman said.