A fake arm would make sense as in lost an arm building devices. Guy with the fake arm has a big nose and may have some similarities in appearance to Suspect #2 but I don’t think it is the same guy. Suspect #2 has lighter skin I believe. Suspect #1 on the other hand appears to have darker skin than anyone on the facebook photo and appears too short to be that tall guy in back. The tall guy in the back of the facebook photo doesn’t look like either of them in my opinion. Suspect #1 has very dark skin and might be Pakistani.
Pakistani, you say:
http://www.foxnews.com/us/2013/04/18/us-seeks-information-from-pakistan-on-list-names/