Two Azerbaijani officers and one soldier from the breakaway Nagorno-Karabakh region were reportedly killed in the latest border clash.
The Azerbaijani Defense Ministry issued a statement on May 28 saying that "Armenian saboteurs" had attacked Azerbaijani positions in the Fizuli district overnight, killing two Azerbaijani officers and injuring one soldier.
For its part, Nagorno-Karabakh's de facto Defense Ministry said on May 28 that one of its soldiers was killed while preventing the entry of "saboteurs" from the Azerbaijani Army onto territory controlled by the breakaway region's forces.
Last week, separatist authorities accused Azerbaijani forces of killing one of their soldiers, while Baku claimed that three of its officers had been injured in a cease-fire violation.
Baku and Yerevan remain locked in hostilities over Nagorno-Karabakh, the Azerbaijani territory that was seized by Armenian-backed separatists during a war in the early 1990s.