Subscribe | UPI Odd Newsletter Subscribe KARLSKRONA, Sweden, Feb. 19 (UPI) -- The principal of a school in Sweden's Blekinge province says a garden of 13 marijuana plants was found in the school's attic because of a water leak. The unidentified principal of the Blekinge primary school said it appears someone accessed the school's attic via a fire ladder and was growing 13 marijuana plants, Blekinge Lans Tidning reported Friday. Advertisement Maintenance workers found the marijuana plants Thursday while investigating a report of a water leak at the school. Heating lamps and lights were reportedly being used in the marijuana farm to help the plants grow. Blekinge Lans Tidning said only one of the plants was showing signs of life when the illegal items were discovered. The newspaper said police are investigating the situation as the seized plants are being analyzed.