Let's hope not.
Hard to see how that could happen if the plugs were properly fused, unless a flex was trapped under the bookcase, got damaged, created a L-N fault of about 15Ω, and 3.5kW started a fire before the fault got to a low enough resistance to cause a protective device to operate.
Hard to see how that could happen if the plugs were properly fused, unless a flex was trapped under the bookcase, got damaged, created a L-N fault of about 15Ω, and 3.5kW started a fire before the fault got to a low enough resistance to cause a protective device to operate.