TEHRAN,Young Journalists Club (YJC) - The child was shot in the leg and is expected to survive, but two of three adults injured in the attack suffered life-threatening injuries.
Those in the group were related and police said they did not believe the shooting was random, CBS News reported.
It happened at about 8.40pm on Sunday outside the Texas Roadhouse restaurant in San Antonio, police said.
San Antonio Police Department chief William McManus told reporters: "We do not believe that this shooting was random.
"The folks were waiting outside to eat when the shooting occurred.
"We're looking for a male suspect who ran through the hotel over here.
"The call first came out as an active shooter [but] this was not an active shooter situation."
The adults were all aged in their 20s, he said.
A description of their attacker was not available because "he was covered", McManus added.
A semi-automatic handgun was reportedly used in the shooting.