The fighters appear to be led by Shahidullah Shahid, a former representative of the Pakistani Taliban.
Police in Nigeria say a girl as young as 10 detonated a bomb that killed her and 19 others, while injuring 18.
Morten Storm, who spied on al Qaeda for Western governments, says other such cells could be in place across Europe.
The loosely organized hacking group says it will target the social media accounts of “terrorists.”
If al Qaeda is behind the shootings, it could signal more attacks on Western targets, but it wouldn't necessarily mean the terrorism group is making a major comeback.
The Yemen branch of al Qaeda claimed responsibility for the attack at weekly satirical magazine Charlie Hebdo in Paris on Wednesday.
Shortly before being killed by special forces, one of the Charlie Hebdo attackers spoke to a reporter.
The al Qaeda preacher had previously called for the killing of Charlie Hebdo's editor, Stephane Charbonnier.
The image, shared over 100,000 times on social media, went viral after being shared by a fake account claiming to belong to Banksy.
The decision to send the US attorney general comes even as countries across Europe have beefed up security to prevent further attacks.
Al Qaeda militants in Syria are plotting attacks to inflict mass casualties in the West, possibly against transport systems or "iconic targets", the head of Britain's MI5 Security Service said on Thursday.
“The dilemma is, you don’t want to take major steps that elevate these barbaric killers into something other than what they are,” an expert said.
Depicting the prophet in images and illustrations is not traditionally blasphemous in Islam, but disrespect is.
Militants in Libya who claimed allegiance to the Islamic State group said they executed two journalists kidnapped in September.
Police have reportedly detained two suspects in what is being described as "a big Indian Mujahideen (IM) catch.”
Jabhat al-Nusra militants on Wednesday demolished the tomb of Imam Nawawi, a thirteenth-century Islamic scholar.
It is unclear whether the shooting is connected to the Charlie Hebdo attack on Wednesday.
It is not clear which militant group the attackers belonged to or whether the attack on Charlie Hebdo was a “lone-wolf” one.
The kidnappings come just days after a senior ISIS 'police' official was found murdered.
Charlie Hebdo, the French publication that was fatally attacked on Wednesday, provoked a wide assortment of religious and political controversy.
Nigeria's booming economy and upcoming elections are threatened by challenges from Boko Haram.
The man was an Egyptian national and was known as the deputy "emir" of the al-Hesbah force in a Syrian province.