ALPENA, Mich. — A pole barn fire that broke out this afternoon on Cathro Road in Alpena remains under investigation. First responders from the Maple Ridge Township Fire Department say the property owner was not at home when the blaze started, but thankfully no other structures were damaged. The blaze was knocked down about 45 minutes after fire fighters arrived on the scene. First responders from the City of Alpena along with Michigan State Police assisted on the call. No injures were reported.