Authorities are looking for a thief who has robbed several people at knifepoint on the No. 1 train in Manhattan.
Police say the suspect committed "numerous robberies" between Sept. 22 and Oct. 6 on the No. 1 train in the Tribeca area.
In each case, he shows a knife and demands money from the victims. The times of the robberies weren't clear.
Anyone with information is asked to call Crime Stoppers at 1-800-577-8477.
