This form reports the number of aliens apprehended by region and country of nationalization. These actions include the apprehension or arrest, detention, return, and removal from the United States of foreign nationals who are removable under U.S. immigration law.  Foreign nationals may be removable from the United States for violations including failure to abide by the terms and conditions of admission or engaging in crimes such as violent crimes, document and benefit fraud, terrorist activity, and drug smuggling.

Data in 2008 include administrative arrests conducted by ICE ERO.  Data from 2009 to the present include administrative arrests conducted by ICE ERO and administrative arrests conducted under the 287(g) program.

Primary responsibility for the enforcement of immigration law within DHS rests with U.S. Customs and Border Protection (CBP) and U.S. Immigration and Customs Enforcement (ICE). CBP is generally responsible for immigration enforcement at and between the ports of entry and ICE is generally responsible for interior enforcement.