The Armenian defense ministry said on Saturday that the clashes occurred near the town of Shusha, located some 15 kilometers from Karabakh's main city of Stepanakert.
Shushan Stepanyan, the ministry spokeswoman, reported "especially intensive and fierce combat" overnight outside Shusha, and added that numerous attacks from Azerbaijan had been foiled.
Armenia also claimed that there was regular shelling on Shusha throughout the night, with the Azerbaijani Defense Ministry rejecting the claim as "completely untrue.”
Meanwhile, Azerbaijan's President Ilham Aliyev announced on Saturday that Azerbaijani army had liberated 16 more villages in the Karabakh region from Armenia's occupation.
Since September 27, a new wave of clashes, the worst in decades, has been going on between Azeri troops and the Armenian-backed separatists of the Nagorno-Karabakh region, with both Yerevan and Baku accusing each other of provocation.
The contested region, home to ethnic Armenian people, is internationally recognized as Azerbaijani territory, but it has been under the control of Armenian-backed separatists since the early 1990s after they seized it by military force.
Following the flare-up, Russia brokered two ceasefires to bring to an end the deadly conflict, but its efforts to bring peace to the mountainous region failed as Yerevan and Baku continued to violate the agreements.