Sixteen boys from the Hudson Valley were rushed to the hospital with an unknown illness after a trip to Ukraine.

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On Tuesday, about 20 Yeshiva Bochrim boys were taken to a hospital after they landed in New York City from Ukraine. The group was complaining about nausea, vomiting, tachycardia, fever and other symptoms, according to Yeshiva World.

Eight of the boys are from Monsey, seven are from Kiryas Joel and one is from Catskills, Hamodia reports.

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All of the boys ate a tuna fish sandwich before their flight, which is believed to have been the cause of their mysterious illness. Doctors haven't confirmed food poisoning was the cause of their illness.

Wednesday morning most of the group was released from the hospital.

However, three remained hospitalized. Two were dealing with an irregular heartbeat and a third was said to be in ICU.

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