After leaving the library, Harris and Klebold entered the science area, where they caused a fire in an empty storage closet. It was extinguished by a teacher who had hidden in an adjacent room. The gunmen then proceeded toward the south hallway, where they shot into an empty science room. At 11:44 a.m., they were captured on the school security cameras as they re-entered the cafeteria. The recording shows Harris kneeling on the landing and firing a single shot toward one of the propane bombs left in the cafeteria, in an unsuccessful attempt to detonate it. As Klebold approached the propane bomb and examined it, Harris took a drink from one of the cups left behind. Klebold lit a Molotov cocktail and threw it at the propane bomb. About a minute later, the gallon of fuel attached to the bomb ignited, causing a fire that was extinguished by the fire sprinklers a few minutes later. They left the cafeteria at 11:46.