US warplanes have violated Iranian airspace in the southwestern oil-rich province of Khuzestan, Al-Alam Arabic language news satellite channel quoted a local military chief as saying on Sunday.

"Two US aircraft trespassed into Iranian airspace northwest of (the southwestern port city of) Abadan before flying southwest into Iraq," a local Revolutionary Guards commander in Abadan identified only as Colonel Aqili was quoted as saying on the channel's website.

"The planes left white vapour trails, attracting the local people's attention," he said, without elaborating on when the alleged incursion took place.