Authorities said the couple fired after they mistakenly thought the group was trespassing on their property.
Bishop said the area includes a dirt road, trees and overgrown brush and that it wasn't uncommon for people to go off-roading there. The Houston Chronicle reported that a sign in front of the suspects' home reads: "Trespassers will be shot. Survivers will be reshot!! Smile I will."
Liberty County Chief Deputy Ken DeFoor said Sheila Muhs fired a 12-gauge shotgun once, then handed it to her husband, who also fired once.