Forum:Unknown Ships in Mass Effect 1

Hey I'm not sure if this question has ever been asked or if this is the right place to ask but I was recently playing ME1 and in the cutscene when the Normandy first approaches the citadel after Eden Prime and the crew is talking about the destiny ascension, in the background I can see a few ships that I've never seen anywhere else. Here is a link to a youtube video with this cutscene http://www.youtube.com/watch?v=P8ilgzRxf1g and you can see these ships at around 1:00. If anyone knows what these ships are I'd appreciate knowing. The only two options I can think is either they are freighters; but they don't really look like it; or they are salarian ships. Thanks