Panic has gripped Cameroon's capital, Yaounde, after a confidential letter from the country's defense minister leaked to social media stating that Boko Haram terrorists had arrived in the city. The letter from Joseph Beti Assomo to top military officers called for vigilance and additional deployment of troops to ministerial buildings and public areas, such as markets, churches and schools. Channel Africa's Moki Kindzeka reports from Yaounde.