§ 140.17 Criminal trespass in the first degree.
  A  person  is  guilty of criminal trespass in the first degree when he
knowingly enters or remains unlawfully in a building, and when,  in  the
course of committing such crime, he:
  1.   Possesses,  or  knows  that  another  participant  in  the  crime
possesses, an explosive or a deadly weapon; or
  2.   Possesses a firearm, rifle or shotgun, as those terms are defined
in section 265.00, and  also  possesses  or  has  readily  accessible  a
quantity  of  ammunition  which is capable of being discharged from such
firearm, rifle or shotgun; or
  3.   Knows  that another participant in the crime possesses a firearm,
rifle or shotgun under circumstances described in subdivision two.
  Criminal trespass in the first degree is a class D felony.