Any member of a duly organized state, county or municipal peace unit of another state of the United States who enters this Commonwealth in close pursuit, and continues within this Commonwealth in such close pursuit, of a person in order to arrest him on the ground that he has committed a felony in such other state shall have the same authority to arrest and hold in custody such person as members of a duly organized state, county or municipal peace unit of this Commonwealth have to arrest and hold in custody a person on the ground that he has committed a felony in this Commonwealth, if the state from which such person has fled extends similar privileges to any member of a duly organized state, county or municipal peace unit of this Commonwealth. If an arrest is made in this Commonwealth by an officer of another state in accordance with the provisions of the first paragraph of this section, he shall without unnecessary delay take the person arrested before a judge of a general district court, or of the circuit court, of the county or city in which the arrest was made, who shall conduct a hearing for the purpose of determining the lawfulness of the arrest. If the judge determines that the arrest was lawful he shall commit the person arrested to await for a reasonable time the issuance of an extradition warrant by the Governor. If the judge determines that the arrest was unlawful he shall discharge the person arrested. The first paragraph of this section shall not be construed so as to make unlawful any arrest in this Commonwealth which would otherwise be lawful. For the purpose of this section the word “State” shall include the District of Columbia.