India, Oct. 8 -- At least six people, including four women, were killed and eight others were injured in an explosion inside a firecracker unit in Andhra Pradesh's B R Ambedkar Konaseema district on Wednesday afternoon, police said.

According to police officers, around 40 people were working for the upcoming Diwali festival when the explosion took place around 12:30 pm at Lakshmi Ganapathi Fire Works factory in Rayavaram block, V Savaram village.

Authorities suspect that a few workers may still be trapped under the debris.

The police are yet to determine what triggered the explosion. The shed walls of the unit collapsed due to the impact of the blast and the "explosion triggered massive flames, engulfing the factory within minutes," a ...