An arson investigation is underway after a fire on the roof of a downtown restaurant. Crews were called to Fujiyama near Tejon and Colorado around 11:50 Monday night. They were able to quickly extinguish the blaze before it caused significant damage to the building. Witnesses report seeing a white man wearing a dark beanie and a red hoodie leaving the scene with a gas tank. They describe him as being between 40 and 50 years old. So far, no one is in custody, and fortunately, no one was hurt.