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Trade groups representing the food, shipping and trucking industries have voiced caution and opposition to a plan by the U.S. Food and Drug Administration to create a potentially sweeping array of regulations governing safe food transportation practices.

Refrigerated carrier Frozen Food Express Industries narrowed its loss to $3.7 million, or 22 cents a share, in the first quarter, compared with a loss of $6.1 million, or 36 cents, a year ago.