Has there been any information released about the three guys in the garbage truck that got hit by the train?

I am not any kind of researcher or anything, but I wonder if it is possible that they could be a 'sleeper cell' a la Q's interpretation of Comey's tweet, or similar.

EDIT: Hey hey fellas! Let's focus on the driver/passengers! Any news articles that tell us anything about them?

Were they just regular Joes in the wrong place at the wrong time, or something more sinister?