The Montgomery County Sheriff's Office is investigating an accidental shooting inside a Walmart in The Woodlands.A single shot was fired in the store at 3040 College Park sometime between 10 and 11 a.m. No one was hurt. Police say the bullet hit a light fixture.Customers described hearing the gunshot."I don't know if it hit the ground or not, but it slipped and it banged and it went off. It was a good, loud noise," James McGowan said."It scared me like crazy, and I have a little baby. I was just thankful she was in the car with her grandma and wasn't in the store with us," Kiki McGowan said. "It really freaked me out. For a second, I thought it was another mass shooting."Authorities describe the situation as an accidental discharge of a gun, but the circumstances surrounding it are not yet known.The scene remains under investigation.