I try to avoid Dundalk as much as possible, but as far as I know there is no significant Muslim (and even less Egyptians) population in that area. I'm very suspicious of why they went to Dundalk. These two men aren't related, so I'd doubt they both have relatives in Dundalk. I'm starting to believe with more certainty they are part of a sleeper cell.
http://www.baltimoresun.com/news/custom/attack/bal-te.md.threat20oct20,0,7434631.story?coll=bal-attack-headlines.
Purely coincidental, I'm sure. No doubt these typical college kids had heard about the not-to-be-missed pizza in Dundalk.