The fiercest clashes between Armenia and Azerbaijan since 2016 broke out on Sunday, and continued throughout Monday, over the breakaway region of Nagorno-Karabakh.
Authorities in the Nagorno-Karabakh region said 27 people were killed in fighting on Monday, bringing its total number of casualties to 58.
As of early Tuesday, at least 67 people are known to have died overall, including nine civilian deaths seven in Azerbaijan and two in Armenia.
The two former Soviet republics have been locked in a territorial dispute for decades.
The Nagorno-Karabakh territory is recognized under international law as part of Azerbaijan, but the majority of its population is Armenian.
As the Soviet Union fell apart three decades ago, Nagorno-Karabakh voted to become part of Armenia sparking a war over the region.
A ceasefire was agreed in 1994, but the two have never managed to agree to a peace treaty.
Both sides are accusing each other of using heavy artillery.
"It is no secret that the first shots, including artillery fire, were opened by Armenia, and the first to die were Azerbaijani servicemen."
Turkey on Monday stood by Azerbaijan, showing their renewed support.
"I once again condemn Armenia who on Sunday attacked Azerbaijani soil. Turkey will continue to stand by its friend and brethren Azerbaijan by all means and with all its heart. "
Most of the international community have called for an immediate ceasefire including the EU, Russia, France, Germany, Italy and the U.S.
Kim Jae-hee, Arirang News.