PATNA, Oct. 25 -- Siwan police and district administration on Saturday launched an operation to check whether firecracker manufacturing units were operating with valid licences after the deadly Friday explosions at a house in Alampur village of the district that left five people dead and two injured. The police on Saturday also disclosed identities of those killed. The deceased were house owner Amiruddin Ahmad, 70, his granddaughter Muskan Siddiqui, 20, granddaughter Khushboo Siddiqui, 10, grandson Arshad Siddiqui, 8, and Rajukumar alias Bhola, 35, Siwan Superintendent of Police Bharat Soni said. The police added that Ahmad's son Marham Azad and daughter-in-law were alive. The severe explosion had demolished the two-storey building and it has proved to be a demanding task to remove the debris. "We are trying to find out if anyone is trapped under the debris," said a police officer. A search operation is underway in the area since Saturday morning, the police said. Heavy quantities of firecrackers, semi-manufactured crackers and explosive materials have been found in nearby houses, which the police and administration have destroyed, added an officer. The demand for crackers climb around Diwali and Chhath puja and certain areas in the district are known for their firecracker producing units. Alampur village is one of them....