UFC chief Dana White says “he hopes it’s not true” that a man who shot eight people in Texas is employed by his organisation.
Police were searching for the gunman, who fled the scene after being turned away from a bar.
He was part of a small group that left a bar in northern San Antonio and walked across the street to another nightspot.
Police chief William McManus said at a press conference that the group was turned away at the door because they were drunk.
One of the members of the group reportedly responded by saying: “Don’t you know who I am? I’m a UFC fighter from California”.
That man then walked back to his car across the street, got a long rifle, walked back to the parking lot and opened fire, McManus said.
But UFC chief White is hoping any links the gunman has with his company turn out to be false.
Speaking after the UFC on ESPN 10 event in Las Vegas, White said: “If you don’t think that I heard about that one at 7am this morning. You know what I mean? I hope it’s not true.
“But I hear that all the time. You know how many bald guys in this town walk around and say they’re me?
“It’s mind boggling. If I told you some of these stories, you wouldn’t believe it.
“I’m hoping that is the case.”
Five women and three men between the ages of 23 and 41 were hurt in the shooting.
Their exact conditions weren’t immediately known, but police confirmed they were stable at local hospitals.
The most serious injury was suffered by someone who was shot in the back.
Two others were grazed but didn’t accept treatment.
Although the shooter remained at large, police have said that they don’t believe there is any risk to the area.