According to state-run Fars News:

TEHRAN (FNA)- After three US citizens were reportedly arrested on Friday for crossing illegally into Iranian territory, officials announced on Saturday that Iranian forces have monitored and registered frequent flights by two US drones over Iran-Iraq bordering areas.
Eyewitnesses said that since last night the two US spy planes have been flying over ‘Ahmed Awa’ area in the Iraqi region of Kurdistan, where the American tourists stayed before crossing into Iran.
Also they said that three US military vehicles also arrived in the region on Saturday morning.

Fars News is also reporting today that “some of the rioters arrested during Iran’s post-election unrests confessed to their links with the anti-Iran terrorist group Mojahedin-e Khalq Organization (MKO), and said that they had received trainings in MKO’s Camp Ashraf in Iraq.”