Almost 4,000 people have died or gone missing while trying to migrate to the U.S. through Mexico since 2014, the Associated Press reports.

Why it matters: The AP's tally is 1,573 more people than what has been previously reported by the UN, and it's likely still an underestimate as some migrants are missing or unreported — and it's just part of the total number of 56,800 migrants that have died or gone missing around the world in that time.