Updated: We've now seen the video and Bolt didn't trip over a cameraman, he was run over by the guy on a segway. Must see video here. Fortunately Bolt is ok
Only guy stopping Bolt tonight was a cameraman. Bolt fell over him on his victory lap and limped a bit getting up but appears ok.
Then a couple minutes later a Chinese guy jumped the fence to get next to Bolt and then tried to go back and was chased by local security.