Possible, But the smell of gas prior to the explosion is usually reported. To smell gas afterwards is likely because of broken lines.
To get just the right mixture to explode is a freak event. The explosion is low velocity and does alot of damage but does not usually throw stuff 100 yards away. This looks fishy to me and I am usually not so suspicious.
We will soon see. I hope this is not suspicious. Unless someone didn't like someone in the housing complex.