NEW DELHIplayinglottoonline, June 22 (Xinhua) -- At least two persons died and four others were severely injured when serial blasts took place inside a factory in India's northern state of Haryana late on Friday nightplayinglottoonline, confirmed a local cop.

The blasts took place inside a factory that manufactured fireballs, a fire-fighting equipment, in the Daultabad Industrial Area of the state's Gurugram district.

According to the cop, some explosive materials were used in manufacturing the fireballs. "The explosive materials caught fire leading the serial blasts," he added.

The blasts were of such a strong intensity that they could be heard at a distance of at least 5 km. Glasses and window-panes of hundreds of nearby houses and factories broke, even as panic-stricken local residents ran out of their houses.

The ill-fated factory was located in the industrial area surrounded by a large number of residential units. The local administration reportedly ordered a probe to know the cause of the serial blasts.■