App stuck while downloading at stage of 2%

Question

I have downloaded two apps using iPhone App Store in the morning and they were downloaded successfully. My apps stuck when I was trying to download 1 of the app called Ninjump. It's still showing in downloading mode but no progress has been made yet.

Rebooting doesn't resolved my problem too. Its still in downloading mode. I have full Internet Speed right now. I can browse as well so there is no chance app is stuck due to Internet.

How can I remove that app which is still in downloading mode?