A powerful explosion at a fireworks storage facility in Karachi, Pakistan’s southern port city, left at least 25 people injured on Thursday, several of them critically, according to police and hospital authorities.

Television footage showed thick smoke billowing into the sky from the building where firecrackers were stored. Broken glass from nearby shop windows littered the road as panicked residents rushed from the scene, witnesses said.

Firefighters worked to extinguish the blaze while ambulances transported the injured, including passersby, to several hospitals, senior police official Asad Raza said.