Deadly border clashes between arch-foes Armenia and Azerbaijan entered a second day on Monday, as the EU and regional power broker Moscow urged restraint.

Three Azerbaijanis were killed on Sunday and one on Monday, oil-rich Baku’s defence ministry said, adding that both sides were using artillery, mortars and tanks in the north part of their border.

The Armenian foreign ministry said the artillery fire from Azerbaijan “receded” later on Monday, claiming Yerevan was “fully controlling” the situation.