Four persons have been arrested for allegedly gangraping a minor girl in Kolkata's adjoining New Town area on Saturday. \u201cThe girl, along with a friend, was taking a stroll on Friday night, when the four accused allegedly attacked the duo, took the girl to an isolated place by force, and raped her,\u201d a police officer said. "A police patrol team that was passing by heard the girl screaming for help and rushed to her rescue. One of the four accused was arrested on the spot. It was after questioning him the police were able to nab the other three,\u201d the officer said. The girl has undertaken a medical examination and an investigation in the case is underway.