RACINE COUNTY, Wis. (CBS 58) -- The Racine Sheriff's Office is investigating after a jet ski accident sent a man to the hospital Monday afternoon.

Police responded to a report of a man unconscious in the water in Brown's Lake near the Fischer Park boat launch around 1:51 p.m.

A jet-ski pulling a recreational inner-tube with four occupants struck a fishing boat with two people in it. Police say the collision caused a man to be thrown from the fishing boat into the lake.

A witness indicated that the man was unconscious, breathing and struggling to stay afloat. 

The jet-ski driver was able to keep the man afloat while another boater in the area lifted him out of the water and onto their boat. The man was then driven to shore where first responders met him.

Flight for Life took the man to a nearby hospital. All other involved occupants were accounted for with no reported injuries.

Police say an investigation is ongoing, and no further information is available at this time.