Bangladesh firefighters on Tuesday brought a blaze at a container depot under control, three days after fiery explosions killed at least 41 people at a facility that a senior fire service official suspected had not followed safety guidelines.

It is reported that drone footage showed smoke and rows of burnt-out containers from the fire that began late on Saturday, triggering blasts and blazes at Sitakunda, 40 km from the southeastern port city of Chittagong.

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Authorities have not determined the cause of the disaster but suspect a container of hydrogen peroxide was the source.

“The fire has not been put out completely but there is no risk of further explosion as our team has sorted out the chemical containers .. one by one,” senior fire service official Monir Hossain told Reuters from the scene.

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On Monday, Ruhul Amin Sikder, secretary of the Bangladesh Inland Container Depots Association said its members, including BM Container Depot, regularly handled hydrogen peroxide without any incident and as far as he knew, the company followed guidelines.

Home Minister Asaduzzaman Khan said an investigation had been launched and those responsible would face justice.

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The confirmed death toll was revised down to 41 from 49 because of some double counting of victims, police said. At least nine firefighters were among the dead and three were missing, they said.

The last major fire in Bangladesh was in July last year when 54 people were killed at a food processing factory outside the capital, Dhaka.

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Bangladesh’s deadliest fire was in 2012, when a blaze swept through a garment factory killing 112 workers.