XENIA, Ohio — A grand jury handed up indictments of involuntary manslaughter and reckless homicide Friday in the deaths of four nursing home residents mistakenly given nitrogen instead of oxygen.

        The Greene County prosecutor said the indictments were against two defendants, but he would not say whether they are individuals or corporations.

        However, prosecutor William Schenck said the grand jury didn't indict two maintenance workers who had contact with the nitrogen tank that was mistakenly connected to the oxygen system at the Carriage-by-Lake nursing home. He said the indictments also were not against the nursing home administrator or anyone at the company that delivered the nitrogen tank.

        Six other residents of the nursing home in Bellbrook, about 10 miles from Dayton, became ill from the tank mix-up Dec. 7. Four women died of nitrogen asphyxiation, in which the brain is depleted of oxygen.

        Authorities said a maintenance worker removed a fitting from an empty oxygen tank and used it as an adapter to connect the nitrogen tank.

        According to the Ohio Department of Health, another maintenance worker who took delivery of the tanks Nov. 29 had set the nitrogen tank aside because the fitting looked different.

        The nitrogen tank had an oxygen label partially covered by a smaller nitrogen label, authorities said. Both employees deny having seen the nitrogen label.

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