The three shooters, Arun Maurya, Sunny Singh and Lavlesh Tiwari, who murdered gangster-turned-politician Atiq Ahmed and his brother Ashraf, were on Monday shifted to Pratapgarh District Jail in Uttar Pradesh due to security concerns. According to intelligence inputs, there could have been an attack on the three in the Naini Central Jail in Prayagraj, where they were earlier taken.