PRAYAGRAJ, March 25 -- In a coordinated late-night operation, police arrested Ansar Ahmed, the owner of the cold storage facility in Prayagraj that collapsed on Monday-killing four workers and injuring 14 others-along with his son Manzoor, and his nephew Alauddin. They were produced before a court on Tuesday and subsequently sent to jail, police said. Meanwhile, according to a complaint filed by SSI Kambod Singh, the cause of the incident has been attributed to the explosion of an ammonia gas chamber.The facility management is also accused of storing potatoes far beyond the authorised capacity.P2...