Mine-sweepers in the breakaway enclave of Nagorno-Karabakh clear the land of cluster bombs.
Its ministry of emergencies says Azerbaijan is using them to bomb the main city of Stepanakert.
Armenia and Azerbaijan accused each other on Tuesday (October 13) of violating a humanitarian ceasefire.
Reuters witnessed shelling in the town of Martuni in Nagorno-Karabakh, and in Terter, in Azerbaijan.
Both sides deny breaking the truce, which was brokered by Russia and went into effect on Saturday.
It was meant to allow a swap of prisoners - and bodies of those killed.
As well as to quell fighting.
The International Committee of the Red Cross urged the two sides to finalize the details so a swap can go ahead -- logistical arrangements and security guarantees.
Nagorno-Karabakh is an enclave in Azerbaijan that is ruled and populated by ethnic Armenians. The fighting over it for the past couple of weeks is the worst since the mid-90s.
It's being watched closely worldwide because the area is a conduit for Azeri oil and gas exports, and because Turkey and Russia, allied to opposing sides, risk being dragged in.
Hundreds of people have been killed, and many more driven into shelters.
And on top of that, the conflict is worsening the spread of COVID-19 in both countries. Armenia's new cases doubled in the past two weeks, while Azerbaijan was up about 80 percent this past week.
Tens of thousands of people could need help over the next three months, prompting the ICRC to issue an appeal.