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.
Many of those leaving have said they fear persecution and ethnic cleansing at the hands of Azerbaijan.
The Armenians of Karabakh began fleeing this week after their forces were routed in a lightning operation by Azerbaijan's military.
Thousands of ethnic Armenians fled the breakaway region of Nagorno-Karabakh by Monday after their fighters were defeated by Azerbaijan.
Azerbaijan says it will guarantee their rights and integrate the region but the leadership of the Armenians in Karabakh stated that they would leave.