The ceasefire negotiated between Azerbaijan and Armenia failed immediately on Sunday. The parties accuse each other of violating the ceasefire, Reuters reports.

According to Azerbaijan, seven people have died in the firing of Armenian troops in the city of Ganja. It is the second largest city in Azerbaijan.

The Azerbaijani Foreign Minister wrote on Twitter that a new “nightly missile attack by Armenian troops on a residential area in the city of Ganja” caused seven deaths. According to the foreign minister, 33 people were injured, including children. This is what AFP says.

A Reuters photographer in Ganja has seen at least one body carried out of the ruins of a large residential building. Reuters is unable to confirm the number of deaths.

The Ministry of Defense of the separatist Nagorno-Karabakh region said Armenian forces are following a ceasefire, and accused Azerbaijani forces of firing on civilian settlements.

The ceasefire negotiated by Russia was due to take effect at noon on Saturday. It was approved by the foreign ministers of both Armenia and Azerbaijan. The intention was to exchange prisoners and those killed in firefights during the ceasefire.

There have been fighting between Azerbaijan and ethnically Armenian Nagorno-Karabakh troops for the past two weeks. The fighting concerns the Nagorno-Karabakh mountain region, which belongs to Azerbaijan but is inhabited ethnically by Armenians. They also hold virtually power in the area. Hundreds have died in the fighting and thousands have been displaced.

The battles that have flared up now are the result of decades of conflict. The fighting was at its worst between 1991 and 1994. At that time, 30,000 people died in the war.