FRESNO, Calif. (AP) -- Federal labor officials have fined two San Joaquin Valley farm labor contractors over separate company van accidents that killed workers last year.

The U.S. Labor Department announced Monday that Riverdale-based Ayala Corp. must pay more than $20,000 for a Dec. 13 crash that killed five farmworkers and injured two others. Authorities say the passengers were not wearing seat belts at the time.

The Fresno Bee reports that officials fined Ayala Corp. for not providing vehicle insurance and ensuring that crew leaders were properly registered.

Labor officials also ordered Madera-based Mid-Valley Labor Services to pay more than $21,000 for an Aug. 3 crash that killed one farmworker and injured four others. Officials found that the company failed to meet federal safety requirements, ensure that drivers had valid licenses and obtain proper vehicle insurance.

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Information from: The Fresno Bee, http://www.fresnobee.com

Copyright 2011 The AP.