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: After the water pollution incident occurred, China has repeatedly informed its neighbor of the details of the pollution incident, including various lab test results such as the pollutant's species and density and the location of polluted stretches. The two sides have agreed to open up a hotline between environmental departments for still better contacts and communication over the water pollution problem, and China informs Russia of the latest developments daily, the Chinese forign minister said.

occurred