The former Manhattan prosecutor running for Nassau County district attorney says a "favorited" tweet about killing LIRR employees over Wednesday's service suspension was a mistake made by one of his interns.

Democrat Michael Scotto said Thursday in a statement that the intern who used his Twitter account "favorited" and "retweeted" a threatening post and had "only paid attention to the part of the tweet thanking me for my support during the delay."

The campaign manager for his Democratic primary opponent, acting District Attorney Madeline Singas, responded in a statement, saying Scotto has "made a habit of saying reckless things unbecoming of the office he seeks."

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"But to suggest that someone should be killed -- even in jest -- goes beyond the pale and is frankly disqualifying," Isaac Goldberg, Singas' campaign manager, said in the statement.

The jousting between the two candidates started after Scotto went to the Long Beach train station to show support for commuters expressing frustration over the long delays on the commuter rail service Wednesday morning caused by a signal problem. Scotto offered support to commuters in a tweet at 5:46 a.m.

Another person, responding to Scotto's tweet, said: "Thanks. If you get elected, can you fire these jokers or have them killed? Over 2 hours so far."

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Originally, Scotto's Twitter account favorited, retweeted and replied to the tweet, but that response was deleted.

"This was a mistake on the part of our intern and I would never condone any violence towards anyone," Scotto said in his statement.