"Armenian armed forces, which did not comply with the humanitarian truce, repeatedly tried to attack the positions of the Azerbaijan army", the Azerbaijani defence ministry said.
Azerbaijan and ethnic Armenian forces accused each other on Monday of launching new attacks in and around Nagorno-Karabakh, increasing strains on a two-day old humanitarian ceasefire meant to end heavy fighting over the mountain enclave. "I believe that eventually we will succeed in securing prosperity and peace on Armenian soil", said Karapetyan.
The two sides were resisting worldwide pressure to start talks to end the latest round of conflagrations, with each side accusing the other of instigating the fighting.
Armenia occupied 20 percent of Azerbaijan's internationally recognized territories including the Nagorno-Karabakh region and seven surrounding districts.
The two neighbours have for decades been locked in a dispute over Nagorno-Karabakh, an ethnically Armenian area which broke away from Baku in a 1990s war that cost around 30,000 lives.
Nagorno-Karabakh's military officials denied attacking Ganja and said the territory's army was observing the ceasefire.
The cease-fire association was introduced in early Saturday, following 10 hours of discussions within the Russian funds sponsored by Russian Foreign Minister Sergey Lavrov, additionally took impact at midday Saturday. The deal stipulated that the cease-fire should pave the way for talks on settling the conflict.
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- A fragile truce in Nagorno-Karabakh was under severe strain on Sunday just one day after it was agreed, with Azerbaijan and Armenia accusing each other of serious violations and crimes against civilians.
Renewed fighting in the decades-old conflict has raised fears of a wider war drawing in Turkey, a close ally of Azerbaijan, and Russian Federation, which has a defence pact with Armenia.
On Sunday morning, the situation was "relatively calm", according to Nagorno-Karabakh leader Arayik Harutyunyan, with just a few "skirmishes".
A man looks out from his damaged home after a ceasefire begins during the fighting over the breakaway region of Nagorno-Karabakh in the city of Terter, Azerbaijan.
The Armenian defence ministry called the Azeri allegations "an absolute lie" and accused Azerbaijan of continuing to shell populated areas inside Karabakh, including Stepanakert, the region's biggest city.
The return of fighting has stoked fears of a full-blown war embroiling Turkey, which strongly backs Azerbaijan, and Russian Federation, which has a military treaty with Armenia.