A major fire broke out at a warehouse in Ontario, California, early Tuesday morning, with one person taken into custody on suspicion of arson. The Cal Fire and Riverside County Fire Department reported a structure fire at the 9500 block of Merrill Avenue/Kimberly Clark Warehouse. The building, which houses paper products, was reportedly a 1-million-square-foot warehouse with visible smoke and flames. No injuries were reported. The Ontario Police Department described this as a "suspected arson investigation".