- The camp in northeastern Nigeria was set up as a refuge for people who had been victimized by Boko Haram
- Sources say three female bombers, disguised as displaced people, entered the camp
- Two set off their suicide vests; a third refused after learning family members were there
Kano, Nigeria (CNN)Two female suicide bombers between the ages of 17 and 20 blew themselves up this week in a camp in northeastern Nigeria set up to shelter people from terrorism, killing at least 58 people. But others were spared when a third intended bomber realized at the last minute that her family had taken shelter there, too, and refused to detonate her explosives, relief officials said.