Leading Western brands including H&M and French supermarket Carrefour admitted their links Wednesday to the latest factory tragedy in Bangladesh after an overnight fire killed seven workers in a fabric mill.

Firefighters battled through the night to douse the inferno at the Aswad Knit Composite factory in Sripur on the outskirts of the capital Dhaka, which broke out when most of its 3,000 employees had gone home.

Workers said the blaze appeared to have been started by a malfunctioning knitting machine, while the country's top inspector said safety problems had been raised last month.

Al Jazeera's Tanvir Chowdhury reports.