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: Accused of taking part in the worst massacres in the 1994 Rwandan genocide, which killed at least 500,000 people, mostly minority Tutsis, the former militia and army soldiers are believed by authorities to be carrying out attacks in northern and western Rwanda. A large number of former militia members and ex-FAR soldiers returned to Rwanda at the end of last year from Zaire, among hundreds of thousands of returning refugees.

massacres