PRAYAGARAJ, March 24 -- Four people were killed and another 13 critically injured after a part of a cold storage facility collapsed in Prayagraj on Monday, police said, adding that efforts were on to rescue the dozens feared buried under the debris. Police said the facility's manager was detained for questioning as part of the preliminary investigation. Following the incident, ammonia gas began leaking from the facility, which fire brigade teams were working to contain, police added. Prime Minister Narendra Modi announced an ex gratia of Rs.2 lakh each for the families of the deceased and Rs.50,000 for the injured. Meanwhile, chief minister Yogi Adityanath also announced a Rs.2-lakh compensation for the kin of the deceased and Rs.50,000 for the injured. DM of Prayagraj, Manish Kumar Verma, said officials have been directed to submit a report within 48 hours and responsible will not be spared.htc...