A secret tunnel discovered last week on the U.S.-Mexico border will be sealed by Mexican authorities, an army official in Ciudad Juarez said Saturday.

Mexican authorities have begun filling a tunnel crossing the border with the U.S. that experts say was likely used to smuggle drugs as well as VIP migrants paying tens of thousands of dollars to enter the country.

Mexican authorities have begun filling in an underground smuggling tunnel that stretches from Juarez to South Central El Paso.