The Iranian state news agency said on Saturday, that the Iranian security forces recently shot down an unknown surveillance drone on its western border.
The unknown drone was flying without being granted permission to enter Iranian airspace.
"After spotting the drone, our air defense system missiles shot it down," Farzad Fereidooni, commander of anti-aircraft system in Kermanshah province was quoted as saying by IRNA.
"We have given warning to 12 unknown flights last year and they have left Iran's air space."
The commander of anti-aircraft system did not mention which country the shot-down drone belonged to. Iran has brought down US surveillance and what it claimed to be Israeli drones in recent years.