A four-alarm fire at a strip mall in Onset was accidental, likely caused by hundreds of lithium-ion batteries stored in the front left corner of a shop, the state fire marshal’s office said Wednesday.

It started with just a simple puff of smoke.Then moments later, the fire spread, fast.A fire on Sunday in Onset caused<a class="excerpt-read-more" href=" More

A large fire that burned through a Wareham, Massachusetts, strip mall this weekend likely started with lithium-ion batteries, fire officials said, sharing video of the blaze erupting.