Help! Man sees sniper!

From a high building he sees a rifle emerging from a curtain and kills someone. It then 'sees' him and he then goes on the run from an unknown assailant!

Can you give any more details like around what year it was made, really anything else because that's not really anything to go on.

ok i'm think this is one of these:
Phone Booth (2003)


or

Wanted (2009)


If not, try to think of more details you can recall

Could it be Sniper 2.


http://en.wikipedia.org/wiki/Sniper_2

.

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All secrets are safe with this man, because none are as deadly to him as his own. His secret is that he is Richard Kimble. (The Fugitive - Conspiracy of Silence)