An earthquake measuring 5.9 on the Richter scale struck Iran's southern province of Bushehr on Sunday, state television reported.
The epicentre of the quake was the town of Rig and hospitals in nearby cities and provinces were on alert, with rescue teams and 50 ambulances sent to the area, a regional official told state TV.
Electricity and landline telephone and internet in the regional city of Gonaveh had been cut off "and people are taking to the streets for fear of earthquakes," news agency Tasnim reported.
An Iranian government official told Reuters there were no reports of damage at the Bushehr nuclear complex, situated on Iran's Gulf coast.
The quake was centred 100 km away from the plant and was relatively shallow - only 10 km deep according to Iranian media - which would have amplified the shaking.
Media reported nine aftershocks and posted pictures that showed collapsed mud brick walls in some villages.
Two people were injured in Gonaveh and were being taken to hospital, state media quoted the head of the Bushehr University of Medical Sciences, Saeed Kashmiri, as saying.
US Secretary of State Marco Rubio said on Thursday that the United States remains prepared to play a "constructive role" in helping bring an end to the war in Ukraine, following talks with Russian Foreign Minister Sergei Lavrov on the sidelines of an ASEAN gathering in Manila.
Indian Prime Minister Narendra Modi said on Thursday that "fast-track" courts would be set up to prosecute those behind exam paper leaks, his first public response after days of youth protests demanding the resignation of the education minister.
Two earthquakes that rocked Venezuela on June 24 caused $19.6 billion in direct physical damage, but the cost of rebuilding could be twice that much or more, the World Bank said in an early assessment released on Thursday.
Ousted Ukrainian defence minister Mykhailo Fedorov said on Thursday he would accept no other government position besides his former job, escalating a political crisis that has gripped Ukraine at a pivotal point in the war with Russia.