Tehran has officially filed a complaint to the United Nations to sue Washington over the recent "violation" of its airspace by a U.S. drone, an Iranian official said Friday.

"The complaint was filed to the UN Security Council over the violation of our airspace by the U.S. drone," Gholam-Hossein Dehqani, deputy Foreign Minister for Legal and International Affairs, was quoted by official IRNA news agency as saying.

General Amir Ali Hajizadeh (C), Iran's Head of the Revolutionary Guard's aerospace division, looks at debris from a downed US drone reportedly recovered within Iran's territorial waters and put on display by the Revolutionary Guard in the capital Tehran on June 21, 2019. [File Photo: AFP/Tasnim News/Meghdad Madadi]

Iran reserves the right to respond "firmly" if the Unite States repeats the violation of the country's airspace, according to the text of the complaint.

On June 20, Iran's Islamic Revolution Guards Corps (IRGC) downed a U.S. "spy" drone in Iran's southern province of Hormozgan.

IRGC claimed that the aircraft had violated Iran's airspace, which the United States denied.