A man who was detained in Chhattisgarh's Durg railway station in connection with the January 16 Saif Ali Khan attack case was released on Sunday. Mumbai police earlier arrested a 30-year-old man from Thane near the metropolis in the case. The man detained from the Mumbai LTT-Kolkata Shalimar Jnaneshwari Express at Durg station on Saturday afternoon was just a suspect and he has been released after inquiry. Mumbai police said it had arrested alleged attacker Mohammad Shariful Islam Shehzad, a Bangladeshi national who had illegally entered India and changed his name to Bijoy Das. As per preliminary probe, he had entered the Bollywood star's home, in Satguru Sharan building in Bandra, in the early hours of January 16 with the intention of theft, police said in the metropolis. Khan (54) was stabbed multiple times in the attack, after which he underwent a five-hour surgery in nearby Lilavati Hospital.