Will US strikes on Nigeria stop violence against Christians?

With Christmas Day missile strikes on sites linked to the Islamic State group, we hear from a Catholic priest in Nigeria.Also in the programme: a BBC Persian TV documentary, in which one of Iran’s leading female actors renounces the compulsory hijab, has broken viewing records; and we look ahead to some of the more unusual sports in next year's Winter Olympics.(Photo: A man standing amid a destroyed building following US strikes in Nigeria's Kwara State. Credit: REUTERS/Abdullahi Dare Akogun)