Armenian artillery position of the self-defense army of Nagorno-Karabakh in Martakert, Nagorno-Karabakh Republic, 03 April 2016. (Photo Credit: TASS)

The breakaway region of Nagorno-Karabakh said on Sunday that 16 of its servicemen were killed and more than 100 wounded in clashes with Azerbaijan’s forces.

Clashes erupted between Armenian and Azeri forces on Sunday over Nagorno-Karabakh, which is inside Azerbaijan but run by ethnic Armenians. That has reignited concerns about instability in the South Caucasus, a corridor for pipelines transporting oil and gas to world markets.

Reporting by Nvard Hovhannisyan; writing by Vladimir Soldatkin; Editing by Catherine Evans