from where vs. where

[Sweetpumpkin]

Hello,

A: A terrorist attack took place a few days ago.
B: From where?

In the dialogue above, B asks "From where?". How about saying just 'where' instead of 'from where'? If the sentence is good as it is, why is 'from' used? If you change it to a full sentence, how can you make it?

Many thanks,
sweetpumpkin

[Mister Micawber]

.
'From where?' doesn't really seem the expected question in this isolated dialogue, but in any case it has a different meaning from a simple 'Where?'. The former asks about the origin of the terrorists, while the latter asks about the target location.
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Native English teacher at Mister Micawber's