Hawaii health officials have ordered several sushi restaurants closed immediately after citing them as a possible source of a Hepatitis A outbreak.

The Hawaii State Department of Health said late Monday that the disease outbreak "is likely due to imported frozen served raw at Genki Sushi Restaurants on Oahu and Kauai."

The department says in a news release that it has ordered the restaurants on the two islands closed " to prevent any further illness and protect the public."

Officials say more details will be released later Tuesday.

The Honolulu Star-Advertiser says that there are 10 of the on Oahu and one on Kauai.

The paper reports that so far 168 people have been infected, mostly on Oahu, in the state's worst outbreak in more than two decades.