A disgusted US shopper has shamed supermarket chain Safeway by posting a photo of a packet of chicken breast with a severed chicken foot inside.

The woman, identified as Lindsey by her Twitter handle @liiindseyyy412, uploaded the photo taken in a Phoenix Safeway store in Arizona along with the message: "Hey, @Safeway, does this look like 'chicken breast' to you? I'm vomiting".

Linsdey claims she was shopping for dinner on Wednesday night when she snapped the photo, which quickly generated a social media frenzy.

Safeway was quick to respond, tweeting back: "Which location was this at?! #yikes #heretohelp"

The supermarket chain has since emailed Linsdey promising a "thorough investigation" into how the foot found its way into the packet.

Some social media users have voiced their disgust but others have rounded on Lindsey for taking offence.

Yeah right...that's a photoshopped human hand!