The police said that all four were history-sheeters and Sudha Anand has 19 cases pending against him, while Muruganandham has six cases against him in Madurai. Sankarapandian, too, has eight cases against him at Thoothukudi, Madurai and Tirunelveli. “They became friends when they were lodged in Madurai Central Prison and decided to carry out burglaries together,” said inspector R Amudha.