My iPhone won't let me delete my photos?

I just downloaded the iOS 7.0 update on my iPhone 4. I imported the photos from my iPhone onto my computer before the update. Then after the update I put them back onto my phone, but decided I wanted to delete some of them. When I tried deleting them(off my phone), there was no option to do so. So now I have 900+ pictures on my phone that I don't want. Please don't tell me to put them in a separate folder bc it's not that I'm concerned about, I just don't want them taking up so much space, and now I can't delete them.

You can't delete synced pics… Uncheck pics in itunes and sync again.

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