The brothers were in a house in the 100 block of North Nevada Court, near Douglas and West Street, about 7 p.m. Friday, Watts said. One of the brothers went to the kitchen to refuel the butane torches they planned to use to light their bongs. He emptied a couple of large cans of butane lighter fluid, leaking butane into the air.

“The butane vapor reached the pilot light in the furnace, and as you might expect, ka-boom,” Watts said.