The quake struck at 2.02 a.m. local time, said Iran’s semi-official media outlet, Fars News Agency.
The tremor, whose epicenter was located in the village of Sayehus, was at a depth of 10 kilometers (6 miles) and inflicted heavy damage on the village and surrounding settlements.
Fifteen aftershocks were recorded minutes after the initial quake, including one of magnitude-6.1 and another at 6.3, said the news agency.
The regions of Kohn, Dejgan and Chan Ahmad were also jolted.
Iranian Revolutionary Guard Corps units were dispatched to quake-hit regions to ensure security and assist residents.
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