Officials are trying to determine what sparked a fire in the historic mansion that was once home to the late engineer and philanthropist of a New Jersey university that bears his name.
No one was injured in the blaze that broke out Thursday night at the Westampton Township estate where Henry Rowan lived.
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Another fire in June left smoke damage.
Rowan died last year at the age of 92. His gift of $100 million to what is now Rowan University was the largest ever to a public institution of higher education.