"Early this morning, the enemy started active shelling along the entire line of contact," Artsakh Presidential Spokesman Vahram Poghosyan wrote on his Facebook page.

"Peaceful settlements are also being shelled, including the capital Stepnakert. We call on the population to take refuge. At the same time, we declare that our response will be proportionate. The entire responsibility for the situation lies with the military-political leadership of Azerbaijan, personally with Ilham Ali," Poghosyan wrote.