Fire officials in Bangladesh say the garment factory where at least 110 people were killed in a fire last month as they made clothing for several international companies did not have a valid fire safety license.

They say the license had expired in June and was not renewed.

Bangladeshi authorities have arrested three factory officials in connection with the fire.

Fire officials say a lack of emergency exits at the Tazreen Fashion factory contributed to the number of deaths.

Officials say at least 500 people have died in Bangladesh in garment factory accidents and fires since 2006. Activists say plant owners are rarely prosecuted for poor safety conditions.

The factory produced clothing for major American and European brands, including Walmart and Disney.

Bangladesh earns about $20 billion annually from overseas clothing sales, roughly 80 percent of its exports.