Terrorists who attacked the Abuja-Kaduna train have freed Sadik, the son of elder statesman and Northern Elders Forum (NEF) convener, Professor Ango Abdullahi.   According to The Nation, a family member of the abducted train passengers confirmed that Sadik Ango Abdullahi was released on Friday April 29, after extensive negotiation.    Sadik is the only son between Prof Abdullahi and late former minister, Hajiya Jummai Alhassan, popularly known as Mama Taraba.    The publication gathered that ransom was paid before his …