Armenia and Azerbaijani forces kept fighting Monday over the disputed separatist region of Nagorno-Karabakh after hostilities broke out the day before, with both sides blaming each other for resuming the deadly attacks.

The Azerbaijani Defence Ministry claimed that Armenian forces started shelling the town of Tartar on Monday morning, while Armenian officials said the fighting continued throughout the night and Baku resumed "offensive actions" in the morning. Azerbaijan's Defence Ministry told the Interfax news agency Monday that over 550 Armenian troops have been killed, a claim that Armenian officials denied.