CNN's Moni Basu, Maggie Schneider, Stephanie Gallman, Darrel Calhoun, Fabi Rodriguez, Greg Botelho, Faith Karimi, Athena Jones and Nick Valencia contributed to this report.
CNN's Barbara Starr, Dan Rivers, Saskya Vandoorne, Laura Perez Maestro, Junko Ogura, Dheepthi Namasivayam, Saad Abedine, Elise Labott, David Mattingly, Athena Jones, Jethro Mullen, Tim Lister, Joe Sterling and Greg Botelho contributed to this report, as did journalists Peter Taggart from Belfast and Said Ben Ali from Algiers.