Eversource line worker John Cox, of Weymouth, describes what it was like trying to help horses caught in a barning Walpole barn.

A lightning strike is the most likely cause of a barn fire that claimed the lives of eight horses in Massachusetts Tuesday night, according to fire officials.

Eight horses were killed in a fire at a 150-year-old barn in Walpole, Massachusetts. It's not yet known what caused the flames, but lightning is being eyed as a possibility. It happened around 11:15 p.m. Tuesday at Mor Linn Farm on North Street. No one was hurt in the fire, but 10 other horses survived.