WASHINGTON — Federal investigators are looking at a farm in Yuma, Ariz., as a possible source of a widespread E. coli outbreak in romaine lettuce, according to the distributor.

Freshway Foods of Sidney, Ohio, said Thursday it recalled lettuce sold in 23 states and the District of Columbia because of a possible link to an E. coli outbreak that has sickened at least 19 people — three with life-threatening illness.

College students at the University of Michigan in Ann Arbor, Ohio State in Columbus and Daemen College in Amherst, N.Y., are among those affected by the outbreak, according to health departments in those states.

Vice president Devon Beer said Freshway Foods worked with the Food and Drug Administration to trace the contaminated lettuce to a Yuma grower, whom he did not identify।

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