A tunnel that Mexican authorities suspect was used to transfer drugs and people across the border was discovered this week near Arizona, the third such tunnel found in the past month.

The Arizona Republic first reported Friday on the tunnel near Nogales, Sonora, across from Nogales, Ariz. Mexican Federal Police posted a video of the tunnel earlier this week.

#Nogales #Sonora. Como parte de nuestro servicio para brindar seguridad en la zona fronteriza, policías federales detectaron un túnel de casi 10 metros de longitud, presumiblemente usado para cometer ilícitos. Tu reporte es seguro y confidencial llama 088 o usa #PFMovil. pic.twitter.com/uenMTmZ6H5 — Policía Federal Mx (@PoliciaFedMx) January 9, 2019

The police said in the video that the tunnel was about 32 feet long, but provided limited information beyond that.

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It is the third tunnel to be found in a month amid the partial government shutdown and increased debate over President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's proposal to build a wall along the U.S.-Mexico border.

A representative from the Department of Homeland Security did not immediately respond to The Hill's request for comment on Saturday.

The government has been partially shut down since Dec. 22 because Trump has demanded more than $5 billion to construct his signature wall.

Democrats have said that Trump's strategy of a border wall would be ineffective in reducing crime and the flow of drugs, in part because of the ability to burrow under walls.

The president has weighed declaring a national emergency to sidestep Congress and direct funds to build the wall, but has so far resisted making such a declaration.