Unemployment and alienation have left many bitter and ripe for recruitment, experts say.
French troops are stationed across West Africa and have fought Al-Qaeda in northern Mali.
The shooting took place at Grand Bassam, a weekend retreat whose beaches, bars and hotels are popular with Westerners.
Abu al-Nur al-Andalusi had previously encouraged Spanish Muslims to "join the jihad."
President Erdogan is conducting a tour of West Africa to boost trade links.
The former Al-Qaeda leader cautioned against prematurely declaring an Islamic state.
The group's North African branch planned to stop attacks in return for the release of its prisoners.
Aid group says that up to 40 percent of the victims were women and children.
Newsweek Europe editor Matt McAllester takes us inside this week's issue.
Paul Refsdal embedded himself with Al-Qaeda's Nusra Front in Syria to detail their everyday lives.
Al-Qaeda in the Arabian Peninsula has taken advantage of conflict in the region.
Syrian fighters use WhatsApp messenger, walkie-talkies and informants ahead of strikes.
At least 20 people died and others were taken hostage when Islamist gunmen stormed the Splendid Hotel.
The president has been trying for years to make good on his pledge to close the facility.
More than two decades of dogged legal work finally paid off.
A new Saudi-led effort has attracted 34 states to counter al Qaeda and ISIS.