Two U.S. Customs and Border Protection officers have been charged with accepting bribes to allow individuals to enter the country without showing documents at America’s busiest border crossing.

CBP Officers Farlis Almonte and Ricardo Rodriguez, who were stationed at the San Ysidro Port of Entry, are alleged by prosecutors to have allowed numerous vehicles carrying illegal immigrants to pass through without adequate checks, receiving thousands of dollars in return.

Court documents unsealed Thursday reveal that investigators discovered phone messages between the officers and human smugglers in Mexico, along with significant unexplained cash deposits in the officers’ bank accounts.

“Any Customs and Border Protection agent who helps smugglers is breaking their oath and putting our national security at risk,” said Acting U.S. Attorney Andrew Haden.

Vehicles queue at the San Ysidro crossing port in Tijuana, Baja California State, Mexico. (Guillermo Arias/AFP via Getty Images)

Rodriguez’s lawyer, Michael Hawkins, said the case is still in the early stages and reminded the public that Rodriguez is presumed innocent. “We look forward to working through the current situation,” Hawkins said, calling Rodriguez “hardworking and loyal.”

It’s not yet clear if Almonte has a lawyer. In the past two years, five CBP officers in the San Diego area have faced similar corruption charges.

The National Treasury Employees Union (NTEU), which represents CBP officers, did not immediately respond to Fox News Digital’s request for comment.

The Associated Press contributed to this report.