So sad, the owners who've lost cats must be devastated
I hope those that made good their escape can be found quickly, if I was local I'd offer to help look for them.
I have a little escape plan for if there was ever a fire in my house, the smoke alarm automatically sends the boys scarpering under my bed so I would have to wrestle them out and put them in a pillowcase before lowering them out of the window using a dressing gown belt or similar, or if there was no time I'd throw them to the grass and hope for the best. Seriously hope I never have to put my plan into action though.