PHILADELPHIA (CBS) – The Transportation Security Administration announced Friday that they intend to fire seven of their employees following the discovery of a bribery scandal at the Philadelphia International Airport.

After an eight month investigation, authorities say a TSA training instructor who was responsible for administering annual proficiency exams was found to have accepted payment from TSA security officers to ensure passing grades.

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A total of ten employees were removed from security duties when the investigation began in November of last year. Since then, three employees have resigned and the seven others were notified by the TSA that they will lose their jobs.

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The training instructor pleaded guilty in February to a charge of bribery.

The TSA released a statement on Friday:

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TSA holds all of its employees to the highest professional and ethical standards and has zero tolerance for misconduct in the workplace. The agency takes prompt and appropriate action with any employee who does not follow TSAs procedures and engages in misconduct. The decision to propose the removal of the seven TSA employees affirms our strong commitment to the safety of the traveling public and to hold all our employees to the highest standards of conduct and accountability.”