Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: A weapons buyback in Australia dramatically ended gun massacres and sharply reduced the number of firearms deaths overall, a study published on Thursday says. The initiative was launched in 1996, within days of a massacre of 35 people in Port Arthur, Tasmania, by a gunman using semi-automatic weapons.

massacres