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.
The US, Iran, and a group of regional mediators are discussing the terms for a potential 45-day ceasefire that could lead to a permanent end to the war, Axios reported on Sunday, citing four US, Israeli and regional sources with knowledge of the talks.
US special forces rescued a downed airman in Iran in a complex operation that averted a potential crisis for President Donald Trump, as the war entered its sixth week with little sign of progress in diplomatic efforts for a resolution.
Two merchant vessels near the Italian coast recovered the bodies of two migrants and rescued 32 survivors from a boat trying to cross to Europe from Libya on Easter weekend, rescue charities said, citing the survivors as saying 71 others were lost at sea.
Nigeria's army said on Sunday that it had rescued 31 civilians who were taken hostage during an attack on a church in northwest Kaduna state, while five people were found dead at the scene.
An Israeli airstrike on Kfarhata, a village in south Lebanon, killed seven people on Sunday, including a 4-year-old child, while another attack on the Jnah neighbourhood in Beirut killed four people and injured 39 others, Lebanon's health ministry said in a statement.