What has happened is that the lease has ended due to the legal doctrine of impossibility. See HERE. This means that the parties can walk away, and this is what seems to be happening.
At this point, the landlord has to provide reasonable time and opportunity for you to get your items from the property. If they do not, you can threaten an action for interference with chattel which is a civil action when someone is denying you access to items that rightfully belong to you. Simply a threat like this - informally - may spur them to give you faster access.
They are not liable for third party actions however, if a third party broke into the property and took some items - before or after the fire, provided that the landlord did not simply leave the door wide open.
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