YUMA, Arizona (KTRK) -- Hundreds of migrants were arrested in Arizona, after crawling through holes under the U.S.-Mexico border.Authorities say U.S. border patrol caught nearly 400 people entering the country illegally through seven holes dug under a steel border fence.They believe smugglers dug the holes, but they haven't been found.Most of the groups are families from Guatemala, including nearly 200 children.