Three construction workers at the World Trade Center site are under arrest for allegedly selling drugs to their co-workers.

Port Authority officials tell NY1 three concrete workers on the center's transportation hub are facing multiple charges.

NY1 is told undercover officers made several drug buys during a sting operation that lasted seven months.

Sources say the three men arrested are from the Bronx, Brooklyn and New Jersey and were working on the transit hub.

NY1 is told they have been banned from the site.

All face charges of criminal possession and sale of marijuana.

This comes after 10 workers at the World Trade Center site were caught drinking on the job, dating back to July.