Apprehensions of undocumented migrants along the U.S. southwestern border fell slightly in March as nations struggle to fight the coronavirus, according to data the Department of Customs and Border Patrol (CBP) released Thursday.

Apprehensions dropped from 30,074 in February to 29,953 in March. More broadly, all Border Patrol encounters fell 7% with 80% of individuals with whom officers are encountering being returned to the country they came from within two hours.

The U.S. closed its southern and northern borders to all non-essential migration following bilateral agreements with Mexico and Canada meant to slow the transmission of the coronavirus in

Read more: US southwest border arrests drop amid coronavirus