4 UFOs Caught By Mars Curiosity? 2012 HD

Four objects caught by Mars Curiosity, very difficult to make out on original image so I have used a few filters to highlight. What are these four objects? UFOs, Dust particles, or something else? As always you decide.Raw Image Here: http://mars.jpl.nasa.gov/msl-raw-images/msss/00003/mcam/0003ML0000037000E1_DXXX.jpgADG Facebook: http://www.facebook.com/pages/Alien-Disclosure-Group/189249627773146Follow ADG on Twitter: http://twitter.com/ADG_UK