Police said Lucas Bourke, 21, of Allenstown, and Ethan Keeler, 21, of Epsom, were killed in the explosion in a detached workshop at New Yard Landscaping on Farrington Corner Road in Hopkinton.
Investigators said the men were using an oxy-acetylene cutting torch to try to get into a safe that contained fireworks. That led to the explosion and the men's deaths, police said.
Police said they believe the two were at the workshop to carry out a burglary.
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