Looks like black vultures in your photo.
Opie...black vultures WILL hunt live prey, and a vulture hopping along with a cat is in the process of killing it to eat it. Sounds like that old house may be a colony cat area, so the vultures are taking advantage of an easy food source. The black vultures are much more aggressive than turkey vultures, and often watch TV's to see where carrion is being scented out or fed upon, and then they will drive off the TV's.
BV's also will attack calves, lambs, piglets and other newborn or very young, vulnerable animals. They attempt to kill and begin eating these animals eyes and noses and the animals usually must be put down due to the extent of their injuries if they survive the birds. Fortunately, these are isolated groups of birds and the damage is not entirely widespread, but that is changing as the birds grow in number. Currently, about 4-5,000 BV's are killed each year under federal permits to eliminate them. To put this in perspective, permits are issued for about 100,000 canada geese annually. Like geese, there are techniques to drive them out of an area and prevent damage, so states are beginning to put those preventive methods in place when vultures first appear.
They also do tremendous damage to vehicles, boats, anything that has vinyl or the rubber stripping/seals. They will attack and strip out the lining on car door frames for example. Their sense of smell is superb and apparently there is a scent that emanates from these materials or the glues used on cars, boats, rv's etc, that mimics some chemicals naturally emanating from decaying carcasses. Their claws also damage surfaces and their feces is very corrosive on many surfaces including materials on rooftops.
Black vultures have always had a southern range, but they are adaptable and have been moving northward for past 15 years, and are becoming more prevalent in midwest, for example. About 20 states have folks apply for depradation permits each year for vultures.
Having said all this, they are amazing birds with fascinating adaptations, and play an important role along with turkey vultures in keeping the landscape free of a lot of disease.
The key to peaceful coexistence with them is to understand the damage and potential danger to small pets and young animals, and when vultures begin to congregate, watch their behavior very closely and be prepared to use hazing techniques if it appears they are settling in an area for a period of time longer than the few days it takes them to consume a deer carcass or whatnot.
Here's a link to USFWS Migratory Bird Southeast region office info on Black Vultures and preventing conflicts with them:
https://www.fws.gov/southeast/birds/black-vulture/
tell them apart, so now they're all named Stan. They appear to be attracted by fire; I was burning some fallen tree debris in a bonfire at the back of my property and they were circling hopefully for hours. 
