What is this rattling sound in the fan area?

My car has a rattling noise in radiator fan area.
It sounds like broken glass. What might be making this sound?
Thank you.

Some or all of the bolts that hold the fan to the pulley extension may be lose. This could cause the fan blades to irregularly touch some parts while rotating. Also check the pulley itself for proper tightness. Check the belt for adequate tension.

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