A person who commits or attempts to commit an act of terrorism commits a class “B” felony. However, notwithstanding section 902.9, subsection 1 , paragraph “b” , the maximum sentence for a person convicted under this section shall be a period of confinement of not more than fifty years. 2002 Acts, ch 1075, §3 ; 2013 Acts, ch 30, §250 See also §707.2(1)(f)