At a crime scene, sounds were heard echoing though the room was soundproof. What explained this odd phenomenon?

Category: Mystery · Difficulty: easy

Hint: Think about artificial sources of sound in silent places

Answer

A hidden speaker played recordings

Explanation

A concealed device can create sounds that seem like echoes unexpectedly.

This is an easy mystery riddle — a good one for children and beginners. The answer is A hidden speaker played recordings.

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