How to delete accidentally imported pictures from iPhone 4S?

I accidentally pressed "Import pictures and videos" when I plugged my iPhone into my computer one day. The result is that my phone now has all the pictures that were on my computer and i can't delete them, the little dustbin simply isn't there. Any help?

You may try this iPhone/iPod file manager. I always use it to delete songs and pictures off my iPhone 4s, it works pretty well all the time.

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