Tragedy vs. Massacre
Considering the fact that no third-party source refers to these events as a "massacre" I think we need to move the title to Khojaly tragedy to avoid any POV here. Massacre is defined as: "an indiscriminate and brutal slaughter of people." British journalist Thomas De Waalthe one credible third-party that is heavily mentioned in article says that the tragedy in Khojaly was a result of a chaotic situation, and not a "deliberately planned" action by the Armenians. Even those who wish to ascribe full blame on the Armenian/Karabakh side cannot argue that this attack was a planned event. The tragedy took place during the Battle of Khojaly. 

Helsinki Watch notes: Helsinki Watch reported that "the militia, still in uniform, and some still carrying their guns, were interspersed with the masses of civilians". HRW states: Human Rights Watch noted that "the attacking party [i.e., Karabakh Armenian forces] is still obliged to take precautionary measures to avoid or minimize civilian casualties. These killings, while immensely tragic and unjustified, were clearly collateral damage during the battle.