Pakistan's Ali Zafar tribute to Peshawar massacre victims

Pakistan's most popular singer-actor, Ali Zafar, is releasing a new song to pay tribute to the victims and survivors of the Peshawar school massacre which killed 150 people, mostly children.

The song titled "Urain Ge" (We Will Fly) is being released this weekend. It features 40 of Pakistan's leading show business personalities.

In conversation with the BBC's Shahzeb Jillani in Karachi, Ali Zafar talks about the concept and motivation behind his new song.