http://www.wtopnews.com/index.php?nid=25&sid=601546
http://www.vh1.com/news/articles/151...headlines=true

So from these two articles I'd say the story goes something like this:

Cam'ron went to DC to promote his new album and movie, "Killa Season," during Howard University's homecoming weekend. He was at H2O Restaurant and Lounge which is sort of a club. It's on the waterfront and pretty upscale, lots of celebrity types go through there so no, it's not "in the worst neighborhood in DC." After leaving H2O, he got in his Lambo and started driving away. Some guys in a van pulled up next to him, pointed guns at him and told him to give them the Lambo. Cam'ron refused to give up the car and started to drive away. One of the guys in the van shot into the Lambo from the side, and a bullet went through both of Cam'ron's arms as he held the steering wheel. He's now at Howard University hospital and doing pretty much fine.