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Tremors were felt in the entire region, including neighbouring Meghalaya and northern parts of West Bengal, they said.
The quake hit Sonitpur district at 7.51 am, they added.
It was followed by two more jerks of 4.3 and 4.4 magnitudes at 7.58 am and 8.01 am, respectively.
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Many buildings in Tezpur, the district headquarters of Sonitpur, Guwahati and other places developed cracks.
Detailed reports are awaited regarding casualty.