PHOENIX (AP) - The Secret Service says it's investigating a Peoria, Ariz., police sergeant who posted a photo on Facebook that shows a bullet-riddled T-shirt with the image of President Barack Obama.

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The federal agency tells The Arizona Republic that a citizen brought the photo to its attention and an "appropriate follow-up" is being conducted.

Peoria police say Sgt. Pat Shearer is a 25-year veteran who remains on active duty, but he also faces an internal investigation into the matter.

The photo shows seven young men. Four of them are posing with weapons and one is holding the T-shirt. It was posted five days before Obama's visit to Chandler on Wednesday but has since been removed from Shearer's page.

A telephone message left for Shearer at work Friday wasn't immediately returned.