Leaders of arch-foes Armenia and Azerbaijan are expected to meet for talks hosted by Russia as fears grow that military clashes may lead to a resumption of one of the bloodiest post-Soviet wars.
The disputed territory of Nagorno-Karabakh has seen fierce fighting since last week between Azeri government forces and ethnic Armenian separatists.
It is described as the worst flare-up of violence in years for the breakaway enclave that lies within Azerbaijan but has a majority Armenian population.
Armenian snipers targeted two children, one aged 9 and the other 14.
Both children were taken to hospital for treatment.
The breakaway enclave said one of its men was killed by a soldier from the Azeri side. That raises the number killed killed on both sides to at least eighteen.
Azerbaijan’s relations with Armenia remain severely strained.
Nagorno-Karabakh has run its own affairs, backed by Armenia, since a war two decades ago killed around 30,000 people.
Despite a 1994 ceasefire, international mediation has failed to secure a permanent settlement.