SINGRAULI (MP), April 19 -- Five masked gunmen barged into a public sector bank and took away gold and cash worth Rs.5.7 crore in Madhya Pradesh's Singrauli district, following which one suspect was arrested from Bihar, officials said on Saturday. Initially, police had said that only Rs.14 lakh was robbed in the incident at a Bank of Maharashtra branch on Friday. The district in eastern MP borders Uttar Pradesh and Chhattisgarh. MP Director General of Police Kailash Makwana, who had rushed to Singrauli late on Friday night, told reporters in Bhopal that he had sought assistance from his peers in UP, Chhattisgarh and Bihar to trace the robbers.He also announced a reward of Rs.50,000 for information leading to their arrest. Kotwali Station House Officer Ashok Singh Parihar said that one of the five suspects has been arrested from the Dehri area in Bihar's Rohtas district. Five armed persons wearing masks stormed the bank premises in Singrauli on Friday and robbed gold jewellery and Rs.20 lakh cash, collectively worth Rs. 5.7 crore, Superintendent of Police Manish Khatri told PTI. The robbers threatened employees and customers at gunpoint and fired shots, and also assaulted some staff members and customers."One suspect pointed a pistol at the bank manager and demanded keys to the gold locker, slapped him and threatened to shoot when he did not comply," said Khatri....