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.

Security has been ramped up on both sides of the border ahead of the inauguration of Donald Trump.

A tunnel along the border wall in Texas, going from Mexico into the U.S. and believed to have been used by smugglers, was discovered last week.

Local lawmakers are responding to the discovery of a sophisticated cross-border tunnel in El Paso's Lower Valley, connecting the city to Juarez.

A smuggling tunnel was recently discovered in a section of the U.S.-Mexico border wall in El Paso, Texas, authorities say. State and federal border protection agencies along with officials from Mexico conducted a joint operation last week in which they found a man-made tunnel that likely is used to smuggle people into the country.

Workers have begun using concrete to close a narco tunnel that officials believe was build within the past year. The tunnel investigation continues.

A tunnel that has been used for a year is used to smuggle migrants, weapons and cash across the U.S.-Mexico border.

Several federal agents have reportedly found a sophisticated "narco tunnel" in El Paso, Texas that has reportedly allowed cartel members to smuggle drugs and even humans into the U.S. undetected by border officers.

Mexican and US authorities on Friday discovered a clandestine tunnel under the Rio Grande River, which connects Ciudad Juarez in Chihuahua to El Paso in Texas. The passage was used for human trafficking,