Army officials said the chopper crashed around 11.45 AM when it was returning to the camp's helipad at Sukna, near Silgirui, from a routine mission.
While three officers died on the spot, a JCO was evacuated and admitted to a hospital in a critical condition.
The army's 33 Corps is based at Sukna and all aircraft of the Army are run by Army Aviation Corps.
(Reopens CAL3)
The deceased were identified as pilot Major Sanjeev
"Saddened at the death of 3 army officers in Sukna due to tragic chopper crash. Words are never enough. My condolences to bereaved families," West Bengal Chief Minister Mamata Banerjee said on Twitter.
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