Arrests of migrant families at U.S.-Mexico border increase - data

FILE PHOTO: A U.S. Border Patrol Agent climbs over a fence while tracking men from Latin America who illegally crossed into the United States from Mexico in Penitas, Texas, U.S., October 5, 2018. REUTERS/Adrees Latif

By Yeganeh Torbati

WASHINGTON (Reuters) - U.S. agents arrested nearly 17,000 members of family units attempting to cross the U.S. border with Mexico in September, a 31 percent increase over the previous month, according to official statistics released on Tuesday.

In a news briefing with reporters on Tuesday, Trump administration officials pointed to the increase in migrant families as evidence of a "border crisis" because those groups are more difficult for immigration enforcement officials to detain and deport because of protections granted by U.S. law to migrant children.

President Donald Trump's administration has expressed alarm at the change in the makeup of migrants attempting to cross into the United States from mostly single adults to children and families travelling together.

About 40 percent of those apprehended in fiscal 2017 and 2018 were unaccompanied children or families with children, compared with 10 percent in 2012, according to the Migration Policy Institute, a non-partisan think tank.

According to numbers released on Tuesday, U.S. border officials arrested nearly 397,000 people in total at the southern border in the 2018 fiscal year that ended Sept. 30, a significant increase over the 304,000 apprehended in 2017 but largely in line with arrest trends of migrants at the U.S. southern border over the past decade.

Border arrests dropped in the months after Trump took office in January 2017 but have rebounded over the past year. Experts believe that Trump's anti-immigrant rhetoric dissuaded potential migrants from crossing in the first months of his presidency.

Trump has vowed to begin cutting millions of dollars in aid to Central America over a caravan of thousands of mostly Honduran migrants fleeing violence and poverty at home.

He has called the caravan, which is currently in southern Mexico, a national emergency as he seeks to boost his Republican Party's chances of maintaining control of Congress in the Nov. 6 elections.

Earlier this year, Trump's administration tried to deter families from travelling to the border by instituting a "zero tolerance" policy, separating thousands of children as their parents were prosecuted.

About 2,500 children and parents were separated before Trump abandoned the policy in June after a public outcry. A federal judge ordered the families reunited, a process that is still incomplete.

(Reporting by Yeganeh Torbati; Editing by Peter Cooney)