It is unclear what caused an abandoned building in Gaston County to catch fire Wednesday morning. The fire occurred around 2:30 a.m. in an abandoned building behind Jakob’s Food Mart on Gastonia Avenue. Firefighters with the Gastonia Fire Department believe the blaze was intentionally set. Firefighters said they've responded to more than a dozen fires at the abandoned building in the past. Crews say fires were previously started intentionally or due to a homeless person trying to stay warm. No other details were released.