KOCHI:The Kalamassery Police on Saturday arrested three persons in connection with a robbery attempt at Unichira near here. According to police officials, Kopra Biju of Thiruvananthapuram, Idukki-native Jinse and Rahul of Kottarakkara were arrested for attempting to break into a house on Monday. While all the accused are habitual offenders, Kopra Biju is accused in more than 40 cases.