How to express shock in English

It is sometimes difficult to say how you feel in unexpected situations, such as natural disasters, especially when you feel sad. Here's a list of some common expressions to help you express shock and disbelief.
Shock
I was shocked to hear…The news came as a complete shock.We're all in complete shock.Everyone's reeling from the shock of…It happened out of the blue.Who could have predicted it?I (just) can't get over ….We were completely taken aback by…I was just stunned by…
Disbelief
I just can't believe…It's unbelievable.I / You just can't imagine…Words can't describe… (how I feel about / the terrible devastation etc)There's no way it could have happened.
Saying how bad something is
It's so awful.It's terrible / What terrible news.It's a tragedy.It's a catastrophe (pronounced "ca – tas – tra – fee" with the stress on "-tas")This is the worst thing that could have happened.