Militant Islamic Front says it 's behind three attacks , in cities of Lagos and Kaduna . The attacks and retaliatory violence left at least 50 people dead , Red Cross says . Boko Haram says the attacks were retaliation for attacks on civilians .
Militant Islamic group says it 's behind three attacks Sunday in cities of Zaria and Kaduna . The attacks and retaliatory violence left at least 50 people dead , Red Cross says . Boko Haram says the bombings were retaliation for attacks on mosques .