The Police Blotter in the Post describes the robbery on the J Train of two teens coming home from a Christmas party. It happened Monday around 3 a.m. as the train was approaching the Bowery station. One of the suspects pulled out a knife and demanded money. According to the report, a second suspect then took the knife and held it to the 19-year old victim’s throat. Police say the victim would not hand over the money, so one of the suspects revealed a gun, allegedly threatening, “I’ll shoot you! I’ve been in the system.” The other victim, also 19, gave them a watch and cell phone. The attackers took off when the train reached Canal Street.