a law enforcement source telling cnn the suspect has plebdged allegiance to isis and that he was motivated by recent actions in gaza. most recently, investigators say ullah had worked during the port authority, doing electrical work along with his brother. he had been licensed to drive a taxi in new york, but it's unclear if he ever did. his license expired in 2015. ullah is a permanent legal resident who came to the united states in 2011 to join family members already living in new york. this attack comes just over a month after an isis sympathizer killed eight people by driving a truck down a busy new york bike path. and tonight, new questions about security levels in new york's transportation hubs. >> listen, we have almost 3,000 transit cops that work in the subway system every day. we have the strategic response group, we have the critical response command. all parts of this system are controlled. >> this is new york. the reality is that we are a