FILE - This Oct. 24, 2016, file photo released by Mexico's Attorney General's Office shows a tunnel that authorities say starts in Tijuana, Mexico, and leads to the United States border. U.S. officials say Mexico's failure to fully seal up border tunnels dug by drug smugglers poses a security risk and is an "open invitation" for Mexican cartels to dig new tunnels. On the U.S. side, drug tunnels have been filled with concrete since 2007, after the Los Angeles Times reported that they were being left unfilled because of budget constraints at Customs and Border Protection. Mexican authorities say they lack the funds to fill the tunnels completely on their side. (Mexico's Attorney General's Office via AP, File)
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