A man allegedly involved in a plot to attack the subway system pleaded not guilty Wednesday to a new indictment that links a fourth person to the failed plot.

In addition to conspiring to use weapons of mass destruction and providing material support to a terror group, Adis Medunjanin, seen above, is accused of attempting to recruit an unidentified man for jihad in Pakistan.

A judge has given prosecutors a week to reveal the man's identity.

That man and several others are now linked to the 2009 plot.