Students experienced an explosive scare on a school bus in Northbridge when a vape pen sparked a fire in someone’s backpack.

The incident took place on Kelly Road around 7:15 a.m. Wednesday as students headed to Blackstone Valley Regional Vocational Technical High School in Upton.

Charred remains were the only thing left of a high school student’s backpack after it burst into flames.

Northbridge Police said a vape battery exploded inside a student’s backpack which sparked the blaze.

The bus driver extinguished the flames with a fire extinguisher and had students evacuate the bus, according to authorities.

A second bus came to pick up the students, a homeowner in the area told 7News.

No injuries were reported.

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