OKLAHOMA CITY (AP) -- The south Oklahoma City office of a company based in The Netherlands has lost 50 workers as part of a nationwide crackdown by federal immigration officials.

Immigration and Customs Enforcement agents on Wednesday arrested seven current and former managers of IFCO Systems, a manufacturer of crates and pallets.

The 50 workers in Oklahoma City are among more than 1,100 people arrested on administrative immigration charges at 40 IFCO sites in the US.

Federal immigration spokesman Carl Rusnok says 46 of the 50 illegal immigrants arrested at the Oklahoma City IFCO office have been sent back to Mexico. He says the other four face deportation because they have criminal backgrounds.

He did not know what percentage of the company's Oklahoma City workforce that number represented.