Caitlin Dickerson:

About 60 of the children were under the age of 5 when they were separated, the documents show.

Though attempts to find the separated parents have been going on for years, the number of parents who have been deemed “unreachable” is much larger than was previously known.

The new findings highlight the lasting impact of a policy that first came to light with wrenching images of crying children being carried away from their parents at the border and detained hundreds or thousands of miles away. Hundreds of these families, the new filing makes clear, have now endured years of separation.