You can bring them there and tell them of this issue. They will be happy to take them in.
Before you take any young kittens away, make sure that the mom hasn't just left temporarily to eat or something, or that she isn't in the process of moving them. Babies that aren't weaned yet stand a decent chance of dying if taken from mom, depending on how young they are. I'd suggest that before you do anything at all, call Animal Care and ask them about the situation.
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