>> reporter: we know that 19-year-old suspect paid $571 for that ticket because that's all he could afford. you can see behind me the apartment building where he lived. a pretty modest apartment building in a very diverse neighborhood. the coney island neighborhood here in brooklyn. raises questions whether they had the means to conductivities like this. we also know the 24-year-old, he was arrested at his home also in this neighborhood. he was a delivery driver. like we hear a lot about these want to be jihadists, they blended it but it was their online language that were the warning signals that got the attention of the fbi. >> there was online mentions on websites if you will, basically, they were pretty blunt. they were talking about potentially killing the president of the united states. that obviously got the attention of u.s. law enforcement authorities last summer.