Raipur, Feb 09: In a major breakthrough, railway police today arrested the main accused in the murder of Prime Minister Atal Bihari Vajpayee's grandnephew Manish Mishra at Janjgir-Champa near here. Manish was pushed out of the Delhi-bound Chhattisgarh Express near Kosi Kalan on January 24 for objecting to eve-teasing. ''The person nabbed hails from Mathura district's ganja paisa village. During interrogation, he confessed to having assaulted Manish,'' Superintendent Rajkumar Devagon told over telephone from Bilaspur. Bureau Report