The rider hit a stationary van, fell from his bike and was hit by another motorcycle.
Greenpeace campaigners spent the night on a gantry at Sheerness port in a protest over diesel cars.
A petition calling on officials to let Ibrahim Keivo perform has now received more than 43,000 signatures.
Who are the world's richest women?
Readers' snaps sent to us
Live coverage of Saturday's League One game between Oxford United and Walsall.
About these results
BBC Radio Oxford Sport: Pre-match
Why we're falling out of love with the roast dinner