Please do not take the kittens away immediately!
It is very important that you make sure that no mother cat is around! It is possible that the mother cat is looking for food, she always stays near her nest and never stays away for more than 2 hours,
So don’t just bring a litter of baby kittens.
If the kittens feel warm and are they sleeping comfortably. Do they have full round bellies and if they don’t squeeck loudly, then there is a good chance that their mother is nearby.
If the mother is nearby, leave the nest alone, because they still need their mother too much!! We can never take the place of a mother cat: her milk, her love and warmth are irreplaceable and are not worth our best care. Do warn the nearest organization / animal shelter that deals with the care of young kittens.
Take a picture of the place where the kittens are lying, and describe this place as clearly as possible, so that we or another organization can place a catch cage here for the mother cat. Mom and kittens can go to the shelter together! Don’t keep looking, because then there is a good chance that the mother cat will move the little ones.