Armenia says four soldiers have been killed and a fifth wounded, in the first flare-up of violence on the border with Azerbaijan since the two neighbours began talks on a peace deal.
Azerbaijan also said it had destroyed an Armenian combat post in the south in retaliation for an earlier incident.
Last year, Azerbaijan recaptured its Nagorno-Karabakh region held for decades by ethnic Armenians and has now been accused by its neighbour of trying to escalate tensions.
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