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.

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.

New video shows smoke shooting from a stand, eventually erupting into flames. Investigators determined that the fire started accidentally in the front left corner of the store, and they are confident that it was caused by the failure of a lithium-ion battery in that area.