How to flush assetBundle if its download fails in between ?

Hello People,

When I start downloading an assetBundle and during the download network connection fails, In this case ... how should I remove the already downloaded part of the assetBundle.

www.error says that it can not load already cached assetBundle (which didn't downloaded completely).

Caching.CleanCache() .... removes my other downloaded assetBundles, I down want that to happen.

I also tried www.Dispose() ..... but nothing really happens my game gets stuck. Also I am not finding any script reference related to it in the Unity Script Manual.

Please Help

Thanks in advance.