Three dogs appeared in my backyard, I don’t know what to do.

Around noon today, 3 dogs (a pit, and two doberman/rottie) dogs appeared in my back yard. We have no idea how they got in there. My kids had a birthday party to attend and my wife posted stuff on NextDoor. No responses. Now we don't know what to do with them, I feel it would be irresponsible to release them, and I don't know of anybody that will take dogs today, especially at such a late hour. Any suggestions?

Edit: they have NO collars. Unsure on microchip.

Double Edit: Dog owners were found (they posted on NextDoor, 5 hours after we did), some neighbors that are behind our next door neighbor's house. Still unsure how they got into our yard.