A Republican congressman is accusing a government agency of "stonewalling" attempts to investigate allegations of animal abuse after graphic photos appeared online showing hunting dogs attacking defenseless coyotes.

The images, allegedly taken by an employee of Wyoming Wildlife Services whose job includes controlling nuisance predators, represent "flat-out animal cruelty," Rep. John Campbell of California said Monday.

Campbell told FoxNews.com that the photos are indicative of widespread problems within the little-known agency -- ranging from possible misuse of taxpayer money to alleged animal abuse of predatory and non-predatory wildlife.

The photos in question were posted by Jamie P. Olson, an employee of Wyoming Wildlife Services, a branch of the U.S. Department of Agriculture's Animal and Plant Health Inspection Service. The photo album reportedly appeared on Olson's personal Facebook account, which has since been deactivated. The photos include images of dogs snarling at and ripping into live coyotes trapped in steel foot-holes, as well as pictures of coyote carcasses