Israel's defense connection with Azerbaijan is believed to have contributed to Baku's capabilities.
Armenian officials say they have reason to believe that Azerbaijan may strike inside Armenia, despite denials.
Pope Francis called for talks between Armenia and Azerbaijan
"The situation often involves families arriving with children so weak that they have fainted in their parents' arms," an aid representative said.
In an exclusive interview, ambassador Arman Akopian describes the situation in Nagorno-Karabakh from his country's perspective.
Azerbaijan says it will respect the rights of ethnic Armenians who choose to stay, but that it has destroyed the concept of a breakaway state forever.
The deadly blast occurred as thousands of ethnic Armenians fled the breakaway enclave after their fighters were defeated by Azerbaijan in a lightning military operation.