"Unless there is a good explanation for the attack, it might be very difficult to move forwards on the peace talks," said Khun Okka, member of Nationwide Ceasefire Coordination Team (NCCT).The NCCT, an umbrella group of several ethnic armed factions, postponed the seventh round of talks planned for November after the army's assault on the training camp near the border town of Laiza, the headquarter of Kachin Independent Army (KIA) on 19 November.
The military says the artillery shell was just a warning shot which inadvertently hit the camp.
Conflicts with several ethnical rebel groups have intensified since peace talks collapsed between the government's Union Peace Working Committee (UPCW) and NCCT in September.
In early December, ethnic Kokang rebels of the self-proclaimed Myanmar National Democratic Alliance Army killed seven soldiers in northeastern Myanmar's Shan State, news reports said.
The prospects of meeting the hoped-for timeframe for a Nationwide Ceasefire Accord were poor, another NCCT official said Monday.
"It's impossible for us to sign the NCA this year, also in early next year as mutual trust still at a low level and we still have a lot to be discussed," the group's deputy leader Naing Hanthta told dpa.