The older brother looks more North African than the younger sibling...
When I first saw the picture of suspect 2, I thought he looked Iranian. When I lived in the DC-area, many of my neighbors were Iranians, good ones who fled from Khomeni. Suspect two looked a lot like some of them. However, like I said, race is only a concern to racists dems who want Reichstag-style event to blame on the Tea Party.