ARAYAT, Pampanga: A fire of undetermined cause broke out Monday at the San Nicolas Elementary School here at about 1:40 p.m. Fire Chief Supt. Aloveel Ferrer said the flame gutted some rooms and the stockroom with textbooks, tables, chairs and test papers. Fire investigators are yet to determine the cause of the fire. No casualty or injury was reported. Investigation is ongoing, Ferrer added.