Free images results:
 

Caution pictures, stock photos and images

 
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Safety sign Stock Image
Author: Freds
Warning Stock Photo
Author: Marilyna
Barbs Stock Photography
Author: Gautier
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Caution Royalty Free Stock Photos
Author: Wojpra
Caution Stock Photography
Author: Ns0mniak