In Part II of this subtitle the following words have the meanings indicated. “Fresh pursuit” includes: fresh pursuit as defined by the common law; and pursuit without unreasonable delay, but not necessarily instant pursuit, of a person who: has committed or is reasonably suspected of having committed a felony; or is suspected of having committed a felony, although a felony has not been committed, if there is reasonable ground for believing that a felony has been committed. “State” means a state of the United States or the District of Columbia.