NEW : The U.N. 's Ban Ki-moon is `` appalled at the frequency and intensity '' of recent attacks . we are all scared , '' he said . A military official tells CNN that at least 156 people were killed . Nigeria closes its borders with Niger and Cameroon and imposes a state of emergency . TL;DR NEW : At least 150 people are reported dead in Nigeria, including women and children.
NEW : The U.N. 's Ban Ki-moon is `` appalled at the frequency and intensity '' of recent attacks . A military official tells CNN that at least 156 people were killed . Nigeria closes its borders with Niger and Cameroon and imposes a state of emergency . TL;DR NEW: At least 150 people are reported dead in Nigeria, including women and children.