Well they haven't released ANY photos or videos yet, so I don't find that so hard to believe.
http://en.wikipedia.org/wiki/Islamic_funeral *ATTENTION* This wiki article was edited as early as today, so take that for what it is. The following links are dated earlier than 2011.
http://mortuarytransport.com/muslim-funeral-customs/
https://www.kfai.org/node/18704
http://www.funerals-and-flowers.com/...oms.html#islam
http://www.bmj.com/content/309/6953/521.extract
http://yojichan.multiply.com/photos/album/72
I mean, it's REALLY easy to Google "Muslim burial rituals" and see that there are plenty of source dated before yesterday (since this is all about a conspiracy to conceal that they didn't really get him, I'm sure) that talk about it needing to be done "as soon as possible" or "within a day". The Muslim's main concern is decay of the body or the disgrace of it being picked apart by predators, etc.
You and your friends have read the entire Quran in the last day? Diligent little scholars!