A 53-year-old Oklahoma man was found early Thursday lying unconscious in downtown Lawrence after witnesses saw him being kicked and beaten by three men.
He was flown by air ambulance to a Kansas City area hospital. His condition was not available.
Witnesses told police the three men came out of a nearby restaurant, saw the Oklahoma man and attacked him.
At 12:20 a.m., police were called to 10th and Massachusetts streets, where the man had been attacked and left lying partially under a bench.
Another man riding by on a bicycle had stopped and yelled at the suspects to stop attacking the victim, police said. He was struck by one of the attackers and knocked off the bicycle, witnesses told police.
The suspects left in a dark, four-door car. An investigation is continuing.