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: Naivasha has been rife with animosity between foreign investors, mainly flower farmers, and the local population over access to resources, and has been the scene of several violent attacks on European residents, although Root's murder is the first in several months. At least three other Europeans have been slain in violent robberies in the Rift Valley since September 2004, prompting great unease and major security fears in the expatriate community.

is