The warrant shall be executed by the arrest of the defendant. It may be executed at any time or place within the state. The officer need not have the warrant in his possession at the time of the arrest, but upon request by the defendant, the officer shall show the warrant to him as soon as possible. If the officer does not have the warrant in his possession at the time of the arrest, he shall then inform the defendant of the offense charged and of the fact that a warrant has been issued. While the complaint is pending, a warrant returned unexecuted and not cancelled or a duplicate warrant may be delivered to the same or another authorized officer for execution.