They say 22-year-old Dwayne Green ran down the officer with a dirt bike.
Green is now charged with attempted murder
Police say 34-year-old Officer Robert Sellers was on his 24-speed bike when he was struck on the 4900 block of Kershaw.
According to police, the 5-year veteran of the 19th district was on patrol with another member of the bike patrol.
They saw a man illegally driving a dirt bike on the block.
"When they went to investigate that motorcycle, the motorcycle fled the block at a high rate of speed going the wrong way," Chief Inspector Scott Small said.
The officers yelled police and ordered Green to stop, but officials say he had no intention of stopping.
"This individual intentionally just ran right toward him and struck him with the bike," Commissioner Charles Ramsey said.
The other officer was not injured and radioed for help.
Police say Green then fled the scene.
"The male who struck the officer's bicycle was operating, they believe, a 250-CC dirt bike motorcycle, green in color, possibly a Kawasaki," Small said.
"This was an intentional act…so we have a pretty good idea who we are looking for," Ramsey said.
Police say dirt bikes and four-wheelers being operated illegally on city streets tend to be a bit of a problems as the weather warms up.
"It's very dangerous, not only for the person on the bike, but for everybody who's on the street at the time," Ramsey said.
Officer Robert Sellers suffered a broken left wrist and a few cuts and bruises.
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