U.S. Immigration and Customs Enforcement says officers arrested a man in Grand Junction this week who the agency identifies as a member of the transnational gang MS-13 and who is wanted in El Salvador on a serious criminal charge. ICE has identified him as Juan Carlos Membreno Portillo.
According to Western Slope Now, officers from ICE Denver took Membreno Portillo into custody in Grand Junction earlier this week. The outlet reports he will remain in federal custody while removal paperwork is processed.
What ICE says about the arrest
ICE’s Denver office stated that Membreno Portillo is a known MS-13 member and that authorities in El Salvador have issued an outstanding warrant for “aggravated terrorist organization membership.” The agency says the arrest happened on Monday and that he will be held in ICE custody pending his removal from the United States, according to its Denver account on X.
MS-13 background and local context
MS-13, formally known as La Mara Salvatrucha, began in Los Angeles and later spread into Central America and across the United States. Federal prosecutors and Justice Department materials say the gang has thousands of members and cliques in numerous states and has been linked to homicides, extortion, and drug distribution. Those patterns are cited by federal agencies as a main reason for prioritizing enforcement focused on transnational gangs, a stance reflected in U.S. Department of Justice coverage.
What happens next
Authorities say Membreno Portillo will remain in ICE custody while removal proceedings move forward. If El Salvador seeks a transfer or extradition, federal and international steps would follow. Western Slope Now reports that ICE Denver expects to keep him detained pending removal to El Salvador, where the outstanding warrant alleges his membership in the gang.
Legal implications
Because there is a foreign arrest warrant for “aggravated terrorist organization membership,” officials indicate this matter will proceed through immigration and international legal channels rather than a local criminal prosecution in Colorado. The details of any transfer or formal extradition request would depend on coordination between U.S. and Salvadoran authorities, as well as standard immigration law procedures used by ICE and the Department of Homeland Security.
