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SAN DIEGO — A tunnel was discovered in Mexico near the Otay Mesa border, the Department of Homeland Security said Thursday.

Officials said they did not know if the tunnel crossed into the United States.

“At this time, U.S. authorities are aware of a tunnel discovered by Mexican law enforcement officials near the Otay Mesa border,” an official statement from the DHS said. “However, we have not yet determined whether the tunnel entered into the U.S.”

Check back for updates on this developing story.