The missing helicopter was sent to a village to evacuate an ill pregnant woman.
Officials say a helicopter carrying six people has gone missing in a mountainous region of Nepal while flying a sick woman to a hospital in Kathmandu.
Government official Khagendra Ghimire said villagers reported seeing smoke coming from a mountain area northeast of the capital. Soldiers and police were traveling to the area to investigate.
The helicopter was sent to a village to evacuate an ill pregnant woman. Contact with the aircraft was lost when it was about 16 kilometers (10 miles) from Kathmandu.