What do you mean by “All Risks”?
When a scope of cover is based on “All Risks” (fire being the common risk to be covered), it includes cover for accidental risks as well. In other words, “All Risks” cover can be viewed as an extension to "Fire and Extraneous Perils" thus making it more comprehensive in nature.
As an example, theft cover in a “Fire and EP” policy requires theft to be accompanied by actual forcible and violent entry or exit to be claimable. However, in an “All Risks” policy, the insurers can offer the removal of the restriction “forcible and violent entry or exit” upon payment of additional premium to cover thefts which do not involve elements of force and violence.