STEPANAKERT, (Azerbaijan): Armenia and Azerbaijan vowed to keep fighting and rejected international calls for negotiations on Wednesday as clashes over the disputed Nagorny Karabakh region raged for a fourth day.

In the breakaway province’s capital Stepanakert, the streets were calm but dark on Wednesday evening, with public lighting shut off.

Some shops were open and there were no sounds of shelling or fighting in the city, which local authorities said had come under fire when a new round of violence over the region erupted on Sunday.

Armenian and Azerbaijani forces are engaged in the heaviest fighting in years over Karabakh, an ethnic Armenian province that broke away from Azerbaijan in the 1990s during the collapse of the Soviet Union.

The confirmed death toll surpassed 100 people including civilians Wednesday and both sides are claiming to have inflicted heavy losses on opposing forces.

Baku and Yerevan have ignored mounting international pressure for a ceasefire, as fears grow that the conflict could escalate into all-out war and draw in regional powers like Turkey and Russia.

Moscow, which has a military pact with Armenia but also good ties with Azerbaijan, has repeatedly called for an end to the fighting and on Wednesday offered to host negotiations.

In separate phone conversations with his counterparts from both ex-Soviet countries, Russian Foreign Minister Sergei Lavrov reaffirmed Moscow’s “readiness” to organise a meeting.

But the leaders of both countries showed no signs of being ready for talks.

Azerbaijan’s President Ilham Aliyev promised his military would keep fighting until Armenian troops withdraw fully from Karabakh.

There has been no let-up in the fighting since the weekend, with both sides reporting new civilian casualties Wednesday.

Officials in both countries have made claims of huge losses for the other side, but these have not been possible to verify. The Armenian side has recorded 81 military deaths and 23 civilians — eight Armenians and 15 Azerbaijanis — have been reported dead.

Azerbaijan’s defence ministry claimed Wednesday its forces have killed 2,300 Karabakh separatist troops since hostilities broke out. The ministry said its forces had “destroyed 130 tanks, 200 artillery units, 25 anti-aircraft units, five ammunition depots, 50 anti-tank units, 55 military vehicles”.