BOSTON (WHDH) - A Boston man was taken into custody Monday after threatening to kill another man on a Red Line train following a dispute over a mask, officials said.

Transit police officers responding to a reported armed assault on the Downtown Crossing platform around 9 a.m. spoke with the alleged victim, who said a man began insulting his mask and telling him he looked “like a duck.”

After the two men argued, the suspect, later identified as 33-year-old Rafael Perez-Medina, allegedly pulled a knife and said, “I’m in the Army, I’ll kill you.”

Afraid for his life, the 28-year-old victim got off the train and contacted the police.

Perez-Medina was then positively identified by the victim and he was placed into custody for assault by means of a dangerous weapon.

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