Azerbaijan’s Defense Ministry said Monday its army units have been attacked by “an illegal Armenian armed group” in Nagorno-Karabakh, killing one Azerbaijani serviceman and wounding another.

The ministry said the attack took place in the Khojavend region on Sunday afternoon and was thwarted, leaving all six attackers dead.

The statement comes just hours after the Armenian Defense Ministry denied media reports of fighting in the neighboring Hadrut region and said the ethnic Armenian forces in Nagorno-Karabakh were “strictly observing” the cease-fire.

Neither Armenian or Nagorno-Karabakh officials have so far commented on Azerbaijan’s statement.