An earthquake shook a province in southwest Iran on Tuesday, Iranian media reported, but there were no immediate reports of damage or casualties.
The official news agency IRNA said the tremor had a magnitude of 5.3 but the country's state broadcaster said on its website later it was milder, with a magnitude of 3.5.
The quake struck about 7:30 a.m. (0400 GMT) near the town of Farrashband in Fars province, where several large gas fields are located, IRNA said.
An official at a gas refinery in the area told Reuters there was no damage to the installation.