Dhaka, July 31 -- A powerful explosion at a fireworks manufacturing site in central Thailand's Suphan Buri province killed at least nine people on Wednesday, according to local authorities.

The blast occurred roughly 95 kilometers northwest of Bangkok, in the heart of Thailand's central rice-producing region. The exact cause of the explosion has yet to be determined.

The Samerkun Suphan Buri Rescue Foundation confirmed nine fatalities and reported that two individuals were critically injured and taken to hospital. Meanwhile, the provincial public relations office stated that one person was injured. Authorities have yet to determine how many people may still be missing.

Police Senior Sergeant Major Pinyo Chanmanee said the explosion too...