Boston mayor Marty Walsh says he is disturbed by allegations that a Boston police officer posted offensive images online, allegations that are now the subject of an internal investigation by Boston Police.

In a statement to WGBH News, Walsh called the posts in question "very disturbing" and commended the Boston Police Department for launching a prompt investigation into allegations that they originated with a police officer.

On Friday, Boston Police Department Spokesman Sergeant John Boyd confirmed that an internal investigation is underway after BPD officials had received a complaint about images allegedly posted on Instagram by officer Carlson Breneus that contain mocking depictions of an older, apparently homeless man.

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Boyd could not confirm whether the images, which have been circulating on Twitter, were originally posted by any member of the Boston Police Department.

A Twitter user named Frederick Joseph, of New York, posted what he said were screenshots of images from from Breneus’ Instagram account.

Boyd said that Breneus has been transferred from a specialized drug enforcement unit to a different post pending the outcome of the internal investigation. No Instagram account in his name is currently online, and Breneus has not responded to requests for comment on the investigation.