BAILEYVILLE, Maine (From news reports) -- The Maine medical examiner's office has determined that two young men working at the Woodland Pulp paper mill died of complications of hydrogen sulfide exposure following a leak in late January.

Kasie Malcolm, 20, was an engineering student from the University of Maine who interned at the mill. He died hours after the Jan. 27 gas leak in the facility's bleach plant. Allen Hornberger, 26, had been working as a process engineer at the Washington County mill for five months. He spent three weeks in the hospital and died Feb. 16.

Hydrogen sulfide had been suspected to be the gas that killed both men, but the chief medical examiner's release of information is the first official confirmation. It's unclear when the medical determination was made. The medical examiner's office said it had not released the information prior to Thursday because of an investigation underway by Maine's attorney general.