HOUSTON, Texas (KTRK) -- Authorities confirmed it was aerosol mace that was sprayed aboard a METRORail train, sending three passengers to the hospital Wednesday afternoon. However, METRO officials now believe it was not an intentional act.

METRO police said the incident happened at about 1:40 p.m. on a Red Line train at the Preston Station downtown.

Police initially reported that an unknown individual had sprayed an unknown chemical substance, but later confirmed that the substance was mace. On Thursday, officials said the injuries of the three people who were hospitalized were non-life-threatening.

Passenger Daniel Ortiz said he didn't see anyone spray anything, but that a man began coughing shortly before the train pulled into the Preston Station.

"The guy next to me started coughin

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