Here's what Texas says regarding injurying a third party innocent person in a shooting:
Texas Penal Code Section--Sec. 9.05 Reckless Injury of Innocent Third Person
"Even though an actor is justified under this chapter in threatening or using force or deadly force against another, if in doing so he also recklessly injures or kills an innocent third person, the justification afforded by this chapter is unavailable in a prosecution for the reckless injury or killing of the innocent third person."
Damage to property can result in a lawsuit, as well.