Definition: The answer will be 'yes' if the provided sentence contains an explicit mention that answers the given question. Otherwise, the answer should be 'no'. Instances where the answer is implied from the sentence using "instinct" or "common sense" (as opposed to being written explicitly in the sentence) should be labeled as 'no'.
Input: Sentence: Eventually, the shelter received word that the alleged hijacker 5 miles away had been a medevac helicopter. 
Question: How often does the shelter have to concern themselves with hijackers.?

No.