The U.S. Department of Homeland Security (DHS) said it plans to run two flights a week, which returns Mexican migrants deep into the country’s interior, starting from the end of January.  

The implementation began last month with flights destined from Tuscon, Arizona to the southeastern Mexican city of Guadalajara to deter illegal immigration, Fox News reported Tuesday.

It is a sharp change in the practice of releasing migrants at the border with an idea to make it harder to attempt a return.

According to the report, DHS said it eyes to return 250 migrants in two flights a week.

Read more: US to return migrants to Mexico to secure borders