A factory fire in Dhaka killed more than 100 people, with some jumping from the 9-storey building, in what officials called Sunday the country’s worst ever industrial fire.

The fire ignited from the ground floor of the Tazreen Fashion garment factory which was immediately engulfed in flames, trapping hundreds of workers who failed to escape through narrow exits and windows. The cause of the fire was not immediately known.

“So far, the confirmed death toll is 109, including nine who died by jumping from the building,” Mizanur Rahman, deputy director of the fire brigade, told Reuters.

Most of the bodies were found on the second floor and many were burnt beyond recognition, according to Mr. Rahman.

The weekend’s fire was the highest death toll in industrial fire in Bangladesh, underlining the poor working conditions in most of the country’s factories, such as overcrowding and reportedly locked fire exits.

Bangladesh is the world’s biggest exporter of clothing, after China, and thanks the industry for 80% of its $24 billion annual exports, says the Financial Times.