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 suicide car bombing attack killed four US soldiers south of Baghdad on Monday, the US military said in a statement. "Four Task Force Baghdad soldiers were killed when a suicide car bomber attacked their checkpoint (Monday) along a road south of Baghdad," said the statement, adding the incident is under investigation.

attack