Iranian state television described the temblor as hitting today near Mashaad, the country's second-largest city. It offered no immediate information on possible damage or injuries.
The US Geological Survey described the earthquake as a magnitude 6.1.
Iran is prone to earthquakes due to a number of faults in the Middle Eastern nation.
In 2003, around 26,000 people were killed by a magnitude 6.6 quake that flattened the historic southeastern Iranian city of Bam.
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