ARLINGTON, Va. (7News) — The Arlington County Police Department (ACPD) is looking for a man who allegedly pulled out a gun on a transit bus.

The man boarded the bus near Glebe and Pershing Road, and got into an argument with the driver. As he was getting off, he made threatening remarks and brought out what appeared to be a gun, ACPD said.

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The man was wearing all black and carrying a black backpack. ACPD is investigating.