On Monday, authorities in Nagorno-Karabakh, who are backed by Armenia, said another 28 of their soldiers had been killed. They had reported 16 fatalities and more than 100 people wounded on Sunday.
Armenian authorities said 200 Armenians were wounded, according to Interfax.
Azerbaijan said two Azeri civilians were killed on Monday, following the deaths of five people from the same family died on Sunday. It added that 30 civilians were wounded.
Nagorno-Karabakh authorities said their forces had reclaimed some territory taken by Azeri troops on Sunday.
Meanwhile, Azerbaijan’s government said on Monday that it had occupied strategically important locations in the disputed region.
Fighting erupted between Armenia and Azerbaijan over the disputed Nagorno-Karabakh region o Sunday.
Accusing Azerbaijan of air and artillery attacks, Armenia reported downing helicopters and destroying tanks, and declared martial law.
Azerbaijan said it had begun a counter-offensive in response to shelling.
Armenia said it had shot down two helicopters and three drones, as well as destroying three tanks.
The region is internationally recognised as part of Azerbaijan but controlled by ethnic Armenians.
Both nations broke away in the dying years of the Soviet Union. They were part of the communist state, which sought to suppress ethnic and religious differences.