NORWALK - Following the recent bombings in the tri-state area, a security expert is weighing in on Metro-North's vulnerability to potential terror attacks.

News 12 spoke with former FBI counterterrorism agent Ken Gray, who now teaches at the University of New Haven. Gray says small, often empty Metro-North platforms are perfect targets.

Gray says riders may not be prepared for the extreme costs and delays that could be attached to ramping up security measures. He says airport-style passenger screening is the only true answer to protect riders.

Some Metro-North riders say they don't think there needs to be screenings at the train stations. Other commuters felt maybe there should be more cameras in place as well as additional officers assigned to trains despite the cost.

Gray says riders could change their minds if something like what happened in New York City occurs on a Metro-North train.

A Metro-North spokesperson says he is unware of any plans to have passenger screenings in place at the stations at this time.