The United States is concerned about possible terrorist attacks in Azerbaijan, Matthew Bryza, the new U.S. ambassador to Baku, told reporters after presenting his credentials to President Ilham Aliyev on Thursday.

Bryza said he and President Aliyev had discussed a number of issues, including a potential terrorist threat.

The U.S. side does not disclose its sources but the fact that this is already a second warning attests to the gravity of the situation, the ambassador said, Interfax reported.