Dear NAME

We are [shocked and] sorry to learn about [your loss in] the [disaster – flood / fire / earthquake / typhoon / tsunami / shooting] that devastated [area]. [We are [anxious / glad] to know [if / that] your family is alright. We hope that no one has been seriously hurt and our thoughts and prayers go to the victims of the [disaster].

Please accept our sympathy and we hope that [area] will soon recover from the [disaster]. In the meantime, do let us know if we can assist you in anyway. We will stand behind you and provide our full support.  

Sincerely yours,

........................................