On January 30, US Immigrations and Customs Enforcement agents arrested a Mexican citizen who was linked to the tunnel via the US warehouse, operated by V&F Distributors LLC. On the Friday before, January 27, immigration authorities reportedly received information that the Mexican cartel behind the operation was threatening the lives of any agents involved with the construction or occupation of the tunnel. US Customs and Immigration, however, pledged to protect them as best they could. Authorities believe Tijuana's Arellano-Felix drug syndicate, or some other well-known drug cartel, was behind the building and operation of the tunnel.
