Arson in the first degree.

(a) A person commits the crime of arson in the first degree if he intentionally damages a building by starting or maintaining a fire or causing an explosion, and when:

(1) Another person is present in such building at the time, and

(2) The actor knows that fact, or the circumstances are such as to render the presence of a person therein a reasonable possibility.

(b) Arson in the first degree is a Class A felony.

(Acts 1977, No. 607, p. 812, §2805.)