Three federal police officers were shot and killed Monday when they tried to arrest drug trafficking suspects at Mexico City’s international airport, officials said.

Airport spokesman Jorge Andres Gomez said the incident took place around 8:50 am (1350 GMT) in the fast-food area of the airport’s Terminal 2. The identity and location of the suspects was not immediately clear.

“Finding themselves surrounded,” the alleged traffickers “opened fire with their weapons against the federal police,” the Public Security ministry said in a statement.

Two federal police officers died at the airport while another died of wounds in the hospital, the statement read.

Federal and local police cordoned off the area and used airport signs to cover the food court windows.