Bangladesh Factory Explosion Kills 25 People, Officials Say

Bangladeshi firefighters and volunteers work to put out a fire and search for survivors at the site of an explosion in a factory in the key Bangladeshi garment manufacturing town of Tongi, just north of the capital Dhaka, on September 10, 2016.
At least fifteen people have been killed and 70 injured, many critically, in a huge fire triggered by a boiler explosion at a Bangladeshi packaging factory, officials said on September 10. / AFP / Rajib Dhar        (Photo credit should read RAJIB DHAR/AFP/Getty Images)

Bangladeshi firefighters and volunteers work to put out a fire and search for survivors at the site of an explosion in a factory in the key Bangladeshi garment manufacturing town of Tongi, just north of the capital Dhaka, on September 10, 2016. At least fifteen people have been killed and 70 injured, many critically, in a huge fire triggered by a boiler explosion at a Bangladeshi packaging factory, officials said on September 10. / AFP / Rajib Dhar (Photo credit should read RAJIB DHAR/AFP/Getty Images)

(CNN) — At least 25 people died when a boiler exploded in a four-story Bangladeshi factory near Dhaka early Saturday, authorities said.

A fire broke out after the explosion, which happened while employees were inside the facility in Gazipur district, local police chief Harunur Rashid said.

Fifty people are hospitalized with injuries, and the death toll is expected to go up as rescue efforts continue, according to the police chief.

Hundreds of firefighters are at the scene attempting to extinguish the fire. The cause of the explosion is unknown.