Police are investigating after a 6-year-old boy and three of his family members were shot Sunday evening in the parking lot of a Texas Roadhouse steakhouse in San Antonio.

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Police Chief William McManus said Sunday that the shooting, which happened as people were waiting outside the restaurant to eat, left the 6-year-old with a gunshot wound to his leg. Police said two of the boy’s three injured family members, all adults in their 20s, were hospitalized Sunday in critical but stable condition.

The shooting happened around 8:40 p.m. outside the Texas Roadhouse steakhouse on Cinema Ridge, the San Antonio Express-News reported.

“We do not believe that this shooting is random,” McManus said. “There were a number of people that were standing (outside the restaurant). All the people that were hit were from the same family.”

The gunman, who has not been identified, fired about 10 shots at the family within 15 feet of the front of Texas Roadhouse, the Express-News reported. He was masked at the time of the shooting, according to the newspaper.

Police continue to investigate the attack.