"Based on an examination of the scene, witness interviews, and other evidence gathered throughout last night and this morning, they collectively determined that the fire was intentionally set"

See the following statement from @massdfs : https://www.mass.gov/news/fire-in-franklin-church-being-investigated-as-arson 

UPDATE: The ATF this afternoon informed State Police fire investigators that they would match up to $5,000 in Arson Watch Reward Program funds in connection with last night’s fire. That would raise the maximum reward for information to $10,000.

Anyone with information on the incident is urged to call 1-800-682-9229.

the maximum reward for information to $10,000

Shared from -> https://www.instagram.com/p/DBhCvnZR1k0/

The Boston Globe also provides coverage of the fire and arson investigation -> 

https://www.bostonglobe.com/2024/10/24/metro/franklin-church-fire-arson/