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: "This could be the start of their retaliatory attacks," said a military official who asked not to be named. Last week's clashes, which left 30 rebels and four soldiers dead, came amid an impasse in ceasefire talks between the two sides, which failed to agree on the disposition of its forces around a rebel camp in the town of Buldon east of here.

clashes