Four visitors to the Crookston Inn have fallen ill with Legionnaires’ disease. A spokesperson for the hotel said yesterday that its pool and spa are remaining closed for another two-and-a-half weeks in response to the illnesses. State health officials announced Friday that the people became ill between January 22nd and January 27th after visiting the hotel for various events, and not as overnight guests. Officials say early evidence traces the source of the infections to the hotel spa. The severity of the peoples’ illnesses isn’t being made public.