Iran's minister of interior, Ahmad Vahidi, travelled to Khoy to observe the situation. Picture used for illustrative purposes only.
The shallow quake hit the city of Khoy in West Azerbaijan province at 9:44pm (1814 GMT), the Seismological Center of the University of Tehran said.
"This incident has left 816 injured and three dead," West Azerbaijan governor Mohammad Sadegh Motamedian was quoted as saying by IRNA news agency, revising up an earlier toll of two dead and 580 injured.
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Following the quake, Iran's minister of interior, Ahmad Vahidi, travelled to Khoy to observe the situation, IRNA reported.
Iran sits astride the boundaries of several major tectonic plates and experiences frequent seismic activity.
On January 18, a 5.8 quake near Khoy left hundreds injured.
In February 2020, a 5.7-magnitude earthquake that rattled the western village of Habash-e Olya killed at least nine people across the border in Turkey.
Iran's deadliest recorded quake was a 7.4-magnitude tremor in 1990 that killed 40,000 people in the country's north, injured 300,000 and left half a million homeless.
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