Largest single group of migrants ever tunnels under wall

A group of 376 migrants, including almost 200 minors, tunneled under the border near Yuma, Arizona, this week. ABC News' Matt Gutman reports.
2:44 | 01/18/19

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Transcript for Largest single group of migrants ever tunnels under wall
Back out of new video showing hundreds of migrants. Crossing the southern border after they burrowed beneath a barrier to get into the US. Border Patrol agents are calling the apprehension this week and usually large. It comes as we learned that more migrant children may have been separated from their parents than previously thought. This morning new video were Border Patrol says the largest group of asylum seekers ever to cross into the US. 376. People including nearly 180 kids all burrowing beneath the border fence near Yuma Arizona. Officials say smugglers dug at least seven holes so the group can make it into the US where they were processed by Border Patrol agents ABC's mag Gutman is the year. To some degree to being exploited by smugglers were telling him to go. In specific routes this one is a very easy one all you have to do was cross the border but there are other places where you have to go either go over. A border wall barrier like this or beneath it. Until places they're actually lifting. Barbed wire in the river signs emerging children to go through it and who we've seen some of this video it's incredibly harrowing. And dangerous. On the same day less than a half hour away hundreds of other migrant were also taken into custody. And this man and his young daughter from Osama door across the border with only the clothes on their backs. A bottle of water and paper showing he's the child's father the chances of them making it to their final destination timber are dirt. That's because of migrants arrive with a child under eighteen at the law says they must be released within twenty days. But once they're here they know that there from not from Mexico and so they can be returned to Mexico. And eventually they're going to claim asylum or they'll I think that that's solve that problem is change in the law and the reason they're trying to. Say that their family units is because they know that if there Fannie and they're going to be recent within twenty days. Meanwhile a new government report says thousands more children were possibly separated from their parents. By immigration authorities than previously known a watchdog report says the total number is quote unknown. Because report communication between federal agencies and a new document leaked by government whistle blowers shows the truck administration consider the option of separating families. In 2017. As a way to curb illegal immigration at the border. The memo challenges what Homeland Security secretary cures and Nielsen has said several times in the past. Writing on Twitter and June we do not have a policy of separating families of the border. Pure yet in response of the document a DH a spokesperson says the tribe administration has made clear that all legal options are on the table to enforce the rule of law. Waited mass unchecked illegal immigration and defend our borders. All the total number of illegal crossings has dropped a number of parents of children is on track to quadruple from two years ago.

This transcript has been automatically generated and may not be 100% accurate.

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